This nowCOAST time-enabled map service provides maps depicting the forecasts of the sensible weather and marine weather elements for 12-hr precipitation probability, 6-hr precipitation amount, and snowfall forecasts. Generated by the weather forecasters at regional NWS Weather Forecast Offices (WFOs) and the National Centers for Environmental Prediction (NCEP). The NDFD is a seamless composite or mosaic of gridded forecasts from individual NWS Weather Forecast Offices (WFOs) from around the U.S. as well as the NCEP Ocean Prediction Center and National Hurricane Center/TAFB. The time resolution of forecast projections varies by variable (element) based on user needs, forecast skill, and forecaster workload. Each WFO prepares gridded NDFD forecasts for their specific geographic area of responsibility. When these locally generated forecasts are merged into a national mosaic, occasionally areas of discontinuity will be evident. Staff at NWS forecast offices attempt to resolve discontinuities along the boundaries of the forecasts by coordinating with forecasters at surrounding WFOs and using workstation forecast tools that identify and resolve some of these differences. The NWS is making progress in this area, and recognizes that this is a significant issue in which improvements are still needed. The NDFD was developed by NWS Meteorological Development Laboratory. The spatial resolution is about 2.5 km (1.6 mi) for CONUS, HI, and Guam, 1.25 km (0.8) for PR and 3km (1.9 mi) for Alaska. The probability of precipitation forecasts are available or each 12-hour period out to +72 hours (3 days) from 0000 UTC on Day 1 (current day). Precipitation forecasts are available for each 6-hour period out to +72 hours (3 days) from 0000 UTC on Day 1 (current day). Snowfall forecasts are available for each 6-hour period out to +48 hours (2 days) from 0000 UTC on Day 1 (current day). Day 1-3 forecasts are updated hourly from 00Z to 23Z and for 12-hr precipitation probability Day 4-7 forecasts are updated at 00, 06, 12, 18, and 22Z.

National Digital Forecast Database (NDFD) MetadataThe National Digital Forecast Database (NDFD) Web Services provide a set of gridded weather forecasts for various sensible weather elements in near real-time. These forecasts are generated by a collaboration between the National Weather Service (NWS) field offices and the National Centers for Environmental Prediction (NCEP). The NDFD Web Services offer a seamless, digital mosaic of weather forecasts that can be accessed by users to obtain up-to-date information on a variety of weather conditions.The NDFD's forecasts are gridded, meaning they cover large geographic areas with weather data at specific intervals, providing high-resolution, geographically distributed forecasts. These forecasts can include temperature, precipitation, wind speed and direction, cloud cover, and other meteorological parameters.These web services are hosted by the Office of Dissemination’s CloudGIS team, which ensures the forecasts are readily accessible and deliverable over the internet. Users, including meteorologists, developers, and anyone interested in weather data, can query these web services for up-to-date forecasts in a digital format, enabling integration into applications, websites, and other platforms.NDFD’s Web Services Descriptions:12-Hour Probability of Precipitation Web Service's data layer is the likelihood, expressed as a percent, of a measurable precipitation event (1/100th of an inch or more) at a grid point during the 12-hour valid period. The 12-hour valid periods begin and end at 0000 and 1200 Coordinated Universal Time (UTC).Apparent Temperature Web Service: contains data that is the perceived temperature derived from either a combination of temperature and wind (Wind Chill) or temperature and humidity (Heat Index) for the indicated hour. When the temperature at a particular grid point falls to 50 F or less, wind chill will be used for that point for the Apparent Temperature. When the temperature at a grid point rises above 80 F, the heat index will be used for Apparent Temperature. Between 51 and 80 F, the Apparent Temperature will be the ambient air temperature.Dew Point Temperature Web Service's data is the expected dew point temperature for the indicated hour. Dew point temperature is a measure of atmospheric moisture. It is the temperature to which air must be cooled in order to reach saturation (assuming air pressure and moisture content are constant).Maximum Temperature Web Service's data is the daytime maximum temperature observed from 7 AM to 7PM LST.Minimum Temperature Web Service's data is predicted minimum temperature for a specific location at a given time, allowing users to visualize the lowest expected temperatures across a geographical area.Precipitation Amount Web Service's data is the expected quantity of liquid precipitation accumulated over a six-hourly period. A quantitative precipitation forecast (QPF) will be specified when a measurable (1/100th of an inch or more) precipitation type is forecast for any hour during a QPF valid period. NDFD valid periods for QPF are 6 hours long beginning and ending at 0000, 0600, 1200 and 1800 UTC. QPF includes the liquid equivalent amount for snow and ice.Relative Humidity Web Service's data is a ratio, expressed as a percent, of the amount of atmospheric moisture present relative to the amount that would be present if the air were saturated. Since the latter amount is dependent on temperature, relative humidity is a function of both moisture content and temperature.Sky Cover Web Service’s data is the predicted percentage of the sky that will be covered by opaque clouds at a given time, provided by the National Digital Forecast Database (NDFD). It is a forecast of how much of the sky will be obscured by clouds, expressed as a percentage value.Snow Amount Web Service's data is the expected total accumulation of new snow during a 6-hour period. A snow accumulation grid will be specified whenever a measurable snowfall is forecast for any hour during a valid period. Valid periods for the NDFD begin and end at 0600, 1200, 1800, and 0000 UTC.Temperature Web Service: contains data that is the expected temperature in degrees Fahrenheit valid for the indicated hour.Wave Height Web Service's data is the average height (from trough to crest) of the one-third highest waves valid for the top of the designated hour. Wave Height is a combination of wind waves and swell.Wind Direction Web Service's data is the expected sustained 10-meter wind direction for the indicated hour, using 36 points of a compass.Wind Gust Web Service's data is the maximum 3-second wind speed forecast to occur within a 2-minute interval at a height of 10 meters. Wind gust forecasts are valid at the top of the indicated hour.Wind Speed Web Service's data is the expected sustained 10-meter sustained wind speed for the indicated hour.Wind Speed and Direction Web Service's data is the expected sustained 10-meter wind direction for the indicated hour, using 36 points of a compass. Wind Speed is the expected sustained 10-meter sustained wind speed for the indicated hour. Wind barbs (shown below) are used to denote wind speed and direction.Update Frequency: The data in these service updates hourly. (Click here to see specific Valid Times for update Frequency)Link to graphical web page: https://digital.weather.govLink to data download (grib2): https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/Link to metadataQuestions/Concerns about the service, please contact the DISS GIS teamTime Information:These web services are time-enabled, meaning that each individual layer contains time-varying data and can be utilized by clients capable of making map requests that include a time component.These particular services can be queried with or without the use of a time component. If the time parameter is specified in a request, the data or imagery most relevant to the provided time value, if any, will be returned. If the time parameter is not specified in a request, the latest data or imagery valid for the present system time will be returned to the client. If the time parameter is not specified and no data or imagery is available for the present time, no data will be returned.Valid Time Table:ServiceValid Time12-Hour Probability of Precipitation Web ServiceThe 12-hour valid periods begin and end at 0000 and 1200 Coordinated Universal Time (UTC).Apparent Temperature Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Dew Point Temperature Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Maximum Temperature Web ServiceDisplay 0z every dayMinimum Temperature Web ServiceDisplay at 12z every dayPrecipitation Amount Web ServiceCONUS/OCONUS (forecast is valid at 0z,6z,12z and 18z)Relative Humidity Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Sky Cover Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Snow Amount Web ServiceCONUS/OCONUS (forecast is valid at 0z,6z,12z and 18z)Temperature Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Wave Height Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Wind Direction Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Wind Gust Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Wind SpeedCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Wind Speed and Direction Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)

NDFD temperature, max and min temperature, apparent temperature and relative humidity forecasts

National Digital Forecast Database (NDFD) MetadataThe National Digital Forecast Database (NDFD) Web Services provide a set of gridded weather forecasts for various sensible weather elements in near real-time. These forecasts are generated by a collaboration between the National Weather Service (NWS) field offices and the National Centers for Environmental Prediction (NCEP). The NDFD Web Services offer a seamless, digital mosaic of weather forecasts that can be accessed by users to obtain up-to-date information on a variety of weather conditions.The NDFD's forecasts are gridded, meaning they cover large geographic areas with weather data at specific intervals, providing high-resolution, geographically distributed forecasts. These forecasts can include temperature, precipitation, wind speed and direction, cloud cover, and other meteorological parameters.These web services are hosted by the Office of Dissemination’s CloudGIS team, which ensures the forecasts are readily accessible and deliverable over the internet. Users, including meteorologists, developers, and anyone interested in weather data, can query these web services for up-to-date forecasts in a digital format, enabling integration into applications, websites, and other platforms.NDFD’s Web Services Descriptions:12-Hour Probability of Precipitation Web Service's data layer is the likelihood, expressed as a percent, of a measurable precipitation event (1/100th of an inch or more) at a grid point during the 12-hour valid period. The 12-hour valid periods begin and end at 0000 and 1200 Coordinated Universal Time (UTC).Apparent Temperature Web Service: contains data that is the perceived temperature derived from either a combination of temperature and wind (Wind Chill) or temperature and humidity (Heat Index) for the indicated hour. When the temperature at a particular grid point falls to 50 F or less, wind chill will be used for that point for the Apparent Temperature. When the temperature at a grid point rises above 80 F, the heat index will be used for Apparent Temperature. Between 51 and 80 F, the Apparent Temperature will be the ambient air temperature.Dew Point Temperature Web Service's data is the expected dew point temperature for the indicated hour. Dew point temperature is a measure of atmospheric moisture. It is the temperature to which air must be cooled in order to reach saturation (assuming air pressure and moisture content are constant).Maximum Temperature Web Service's data is the daytime maximum temperature observed from 7 AM to 7PM LST.Minimum Temperature Web Service's data is predicted minimum temperature for a specific location at a given time, allowing users to visualize the lowest expected temperatures across a geographical area.Precipitation Amount Web Service's data is the expected quantity of liquid precipitation accumulated over a six-hourly period. A quantitative precipitation forecast (QPF) will be specified when a measurable (1/100th of an inch or more) precipitation type is forecast for any hour during a QPF valid period. NDFD valid periods for QPF are 6 hours long beginning and ending at 0000, 0600, 1200 and 1800 UTC. QPF includes the liquid equivalent amount for snow and ice.Relative Humidity Web Service's data is a ratio, expressed as a percent, of the amount of atmospheric moisture present relative to the amount that would be present if the air were saturated. Since the latter amount is dependent on temperature, relative humidity is a function of both moisture content and temperature.Sky Cover Web Service’s data is the predicted percentage of the sky that will be covered by opaque clouds at a given time, provided by the National Digital Forecast Database (NDFD). It is a forecast of how much of the sky will be obscured by clouds, expressed as a percentage value.Snow Amount Web Service's data is the expected total accumulation of new snow during a 6-hour period. A snow accumulation grid will be specified whenever a measurable snowfall is forecast for any hour during a valid period. Valid periods for the NDFD begin and end at 0600, 1200, 1800, and 0000 UTC.Temperature Web Service: contains data that is the expected temperature in degrees Fahrenheit valid for the indicated hour.Wave Height Web Service's data is the average height (from trough to crest) of the one-third highest waves valid for the top of the designated hour. Wave Height is a combination of wind waves and swell.Wind Direction Web Service's data is the expected sustained 10-meter wind direction for the indicated hour, using 36 points of a compass.Wind Gust Web Service's data is the maximum 3-second wind speed forecast to occur within a 2-minute interval at a height of 10 meters. Wind gust forecasts are valid at the top of the indicated hour.Wind Speed Web Service's data is the expected sustained 10-meter sustained wind speed for the indicated hour.Wind Speed and Direction Web Service's data is the expected sustained 10-meter wind direction for the indicated hour, using 36 points of a compass. Wind Speed is the expected sustained 10-meter sustained wind speed for the indicated hour. Wind barbs (shown below) are used to denote wind speed and direction.Update Frequency: The data in these service updates hourly. (Click here to see specific Valid Times for update Frequency)Link to graphical web page: https://digital.weather.govLink to data download (grib2): https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/Link to metadataQuestions/Concerns about the service, please contact the DISS GIS teamTime Information:These web services are time-enabled, meaning that each individual layer contains time-varying data and can be utilized by clients capable of making map requests that include a time component.These particular services can be queried with or without the use of a time component. If the time parameter is specified in a request, the data or imagery most relevant to the provided time value, if any, will be returned. If the time parameter is not specified in a request, the latest data or imagery valid for the present system time will be returned to the client. If the time parameter is not specified and no data or imagery is available for the present time, no data will be returned.Valid Time Table:ServiceValid Time12-Hour Probability of Precipitation Web ServiceThe 12-hour valid periods begin and end at 0000 and 1200 Coordinated Universal Time (UTC).Apparent Temperature Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Dew Point Temperature Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Maximum Temperature Web ServiceDisplay 0z every dayMinimum Temperature Web ServiceDisplay at 12z every dayPrecipitation Amount Web ServiceCONUS/OCONUS (forecast is valid at 0z,6z,12z and 18z)Relative Humidity Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Sky Cover Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Snow Amount Web ServiceCONUS/OCONUS (forecast is valid at 0z,6z,12z and 18z)Temperature Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Wave Height Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Wind Direction Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Wind Gust Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Wind SpeedCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Wind Speed and Direction Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)

Note: Find data at source. ・ This map displays the wind forecast over the next 72 hours across the contiguous United States, in 3 hour increments, including wind direction, wind gust, and sustained wind speed.Zoom in on the Map to refine the detail for a desired area. The Wind Gust is the maximum 3-second wind speed (in mph) forecast to occur within a 2-minute interval within a 3 hour period at a height of 10 meters Above Ground Level (AGL). The Wind Speed is the expected sustained wind speed (in mph) for the indicated 3 hour period at a height of 10 meters AGL. Data are updated hourly from the National Digital Forecast Database produced by the National Weather Service.Where is the data coming from?The National Digital Forecast Database (NDFD) was designed to provide access to weather forecasts in digital form from a central location. The NDFD produces gridded forecasts of sensible weather elements. NDFD contains a seamless mosaic of digital forecasts from National Weather Service (NWS) field offices working in collaboration with the National Centers for Environmental Prediction (NCEP). All of these organizations are under the administration of the National Oceanic and Atmospheric Administration (NOAA).Wind Speed Source: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.conus/VP.001-003/ds.wspd.binWind Gust Source: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.conus/VP.001-003/ds.wgust.binWind Direction Source: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.conus/VP.001-003/ds.wdir.binWhere can I find other NDFD data?The Source data is downloaded and parsed using the Aggregated Live Feeds methodology to return information that can be served through ArcGIS Server as a map service or used to update Hosted Feature Services in Online or Enterprise.What can you do with this layer?This map service is suitable for data discovery and visualization. Identify features by clicking on the map to reveal the pre-configured pop-ups. View the time-enabled data using the time slider by Enabling Time Animation.Alternate SymbologyFeature Layer item that uses Vector Marker Symbols to render point arrows, easily altered by user. The color palette uses the Beaufort Scale for Wind Speed. https://www.arcgis.com/home/item.html?id=45cd2d4f5b9a4f299182c518ffa15977 This map is provided for informational purposes and is not monitored 24/7 for accuracy and currency.If you would like to be alerted to potential issues or simply see when this Service will update next, please visit our Live Feed Status Page!

The National Digital Forecast Database (NDFD) contains a seamless mosaic of the National Weather Service's (NWS) digital forecasts of precipitation amounts. In collaboration with NWS National Centers for Environmental Prediction (NCEP) and NWS Weather Forecast Offices (WFO), the central NDFD server ingests 5-km, 2-dimensional grids of precipitation amounts, and creates experimental forecast data mosaics for the coterminous United States (CONUS), Alaska, Hawaii, and Guam.

National Digital Forecast Database (NDFD) MetadataThe National Digital Forecast Database (NDFD) Web Services provide a set of gridded weather forecasts for various sensible weather elements in near real-time. These forecasts are generated by a collaboration between the National Weather Service (NWS) field offices and the National Centers for Environmental Prediction (NCEP). The NDFD Web Services offer a seamless, digital mosaic of weather forecasts that can be accessed by users to obtain up-to-date information on a variety of weather conditions.The NDFD's forecasts are gridded, meaning they cover large geographic areas with weather data at specific intervals, providing high-resolution, geographically distributed forecasts. These forecasts can include temperature, precipitation, wind speed and direction, cloud cover, and other meteorological parameters.These web services are hosted by the Office of Dissemination’s CloudGIS team, which ensures the forecasts are readily accessible and deliverable over the internet. Users, including meteorologists, developers, and anyone interested in weather data, can query these web services for up-to-date forecasts in a digital format, enabling integration into applications, websites, and other platforms.NDFD’s Web Services Descriptions:12-Hour Probability of Precipitation Web Service's data layer is the likelihood, expressed as a percent, of a measurable precipitation event (1/100th of an inch or more) at a grid point during the 12-hour valid period. The 12-hour valid periods begin and end at 0000 and 1200 Coordinated Universal Time (UTC).Apparent Temperature Web Service: contains data that is the perceived temperature derived from either a combination of temperature and wind (Wind Chill) or temperature and humidity (Heat Index) for the indicated hour. When the temperature at a particular grid point falls to 50 F or less, wind chill will be used for that point for the Apparent Temperature. When the temperature at a grid point rises above 80 F, the heat index will be used for Apparent Temperature. Between 51 and 80 F, the Apparent Temperature will be the ambient air temperature.Dew Point Temperature Web Service's data is the expected dew point temperature for the indicated hour. Dew point temperature is a measure of atmospheric moisture. It is the temperature to which air must be cooled in order to reach saturation (assuming air pressure and moisture content are constant).Maximum Temperature Web Service's data is the daytime maximum temperature observed from 7 AM to 7PM LST.Minimum Temperature Web Service's data is predicted minimum temperature for a specific location at a given time, allowing users to visualize the lowest expected temperatures across a geographical area.Precipitation Amount Web Service's data is the expected quantity of liquid precipitation accumulated over a six-hourly period. A quantitative precipitation forecast (QPF) will be specified when a measurable (1/100th of an inch or more) precipitation type is forecast for any hour during a QPF valid period. NDFD valid periods for QPF are 6 hours long beginning and ending at 0000, 0600, 1200 and 1800 UTC. QPF includes the liquid equivalent amount for snow and ice.Relative Humidity Web Service's data is a ratio, expressed as a percent, of the amount of atmospheric moisture present relative to the amount that would be present if the air were saturated. Since the latter amount is dependent on temperature, relative humidity is a function of both moisture content and temperature.Sky Cover Web Service’s data is the predicted percentage of the sky that will be covered by opaque clouds at a given time, provided by the National Digital Forecast Database (NDFD). It is a forecast of how much of the sky will be obscured by clouds, expressed as a percentage value.Snow Amount Web Service's data is the expected total accumulation of new snow during a 6-hour period. A snow accumulation grid will be specified whenever a measurable snowfall is forecast for any hour during a valid period. Valid periods for the NDFD begin and end at 0600, 1200, 1800, and 0000 UTC.Temperature Web Service: contains data that is the expected temperature in degrees Fahrenheit valid for the indicated hour.Wave Height Web Service's data is the average height (from trough to crest) of the one-third highest waves valid for the top of the designated hour. Wave Height is a combination of wind waves and swell.Wind Direction Web Service's data is the expected sustained 10-meter wind direction for the indicated hour, using 36 points of a compass.Wind Gust Web Service's data is the maximum 3-second wind speed forecast to occur within a 2-minute interval at a height of 10 meters. Wind gust forecasts are valid at the top of the indicated hour.Wind Speed Web Service's data is the expected sustained 10-meter sustained wind speed for the indicated hour.Wind Speed and Direction Web Service's data is the expected sustained 10-meter wind direction for the indicated hour, using 36 points of a compass. Wind Speed is the expected sustained 10-meter sustained wind speed for the indicated hour. Wind barbs (shown below) are used to denote wind speed and direction.Update Frequency: The data in these service updates hourly. (Click here to see specific Valid Times for update Frequency)Link to graphical web page: https://digital.weather.govLink to data download (grib2): https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/Link to metadataQuestions/Concerns about the service, please contact the DISS GIS teamTime Information:These web services are time-enabled, meaning that each individual layer contains time-varying data and can be utilized by clients capable of making map requests that include a time component.These particular services can be queried with or without the use of a time component. If the time parameter is specified in a request, the data or imagery most relevant to the provided time value, if any, will be returned. If the time parameter is not specified in a request, the latest data or imagery valid for the present system time will be returned to the client. If the time parameter is not specified and no data or imagery is available for the present time, no data will be returned.Valid Time Table:ServiceValid Time12-Hour Probability of Precipitation Web ServiceThe 12-hour valid periods begin and end at 0000 and 1200 Coordinated Universal Time (UTC).Apparent Temperature Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Dew Point Temperature Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Maximum Temperature Web ServiceDisplay 0z every dayMinimum Temperature Web ServiceDisplay at 12z every dayPrecipitation Amount Web ServiceCONUS/OCONUS (forecast is valid at 0z,6z,12z and 18z)Relative Humidity Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Sky Cover Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Snow Amount Web ServiceCONUS/OCONUS (forecast is valid at 0z,6z,12z and 18z)Temperature Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Wave Height Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Wind Direction Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Wind Gust Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Wind SpeedCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Wind Speed and Direction Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)

The National Digital Forecast Database (NDFD) contains a seamless mosaic of the National Weather Service's (NWS) digital forecasts of precipitation probabilities. In collaboration with NWS National Centers for Environmental Prediction (NCEP) and NWS Weather Forecast Offices (WFO), the central NDFD server ingests 5-km, 2-dimensional grids of precipitation probabilities, and creates experimental forecast data mosaics for the coterminous United States (CONUS), Alaska, Hawaii, and Guam.

description: The National Digital Forecast Database (NDFD) contains a seamless mosaic of the National Weather Service's (NWS) digital forecasts of air temperature. In collaboration with NWS National Centers for Environmental Prediction (NCEP) and NWS Weather Forecast Offices (WFO), the central NDFD server ingests 5-km, 2-dimensional grids of air temperature, and creates experimental forecast data mosaics for the coterminous United States (CONUS), Alaska, Hawaii, and Guam.; abstract: The National Digital Forecast Database (NDFD) contains a seamless mosaic of the National Weather Service's (NWS) digital forecasts of air temperature. In collaboration with NWS National Centers for Environmental Prediction (NCEP) and NWS Weather Forecast Offices (WFO), the central NDFD server ingests 5-km, 2-dimensional grids of air temperature, and creates experimental forecast data mosaics for the coterminous United States (CONUS), Alaska, Hawaii, and Guam.

The National Digital Forecast Database (NDFD) contains a seamless mosaic of the National Weather Service's (NWS) digital forecasts of air temperature. In collaboration with NWS National Centers for Environmental Prediction (NCEP) and NWS Weather Forecast Offices (WFO), the central NDFD server ingests 5-km, 2-dimensional grids of air temperature, and creates experimental forecast data mosaics for the coterminous United States (CONUS), Alaska, Hawaii, and Guam.

This map displays the Quantitative Precipitation Forecast (QPF) for the next 72 hours across the contiguous United States. Data are updated hourly from the National Digital Forecast Database produced by the National Weather Service.The dataset includes incremental and cumulative precipitation data in 6-hour intervals. In the ArcGIS Online map viewer you can enable the time animation feature and select either the "Amount by Time" (incremental) layer or the "Accumulation by Time" (cumulative) layer to view a 72-hour animation of forecast precipitation. All times are reported according to your local time zone.Where is the data coming from?The National Digital Forecast Database (NDFD) was designed to provide access to weather forecasts in digital form from a central location. The NDFD produces forecast data of sensible weather elements. NDFD contains a seamless mosaic of digital forecasts from National Weather Service (NWS) field offices working in collaboration with the National Centers for Environmental Prediction (NCEP). All of these organizations are under the administration of the National Oceanic and Atmospheric Administration (NOAA).Source: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.conus/VP.001-003/ds.qpf.binWhere can I find other NDFD data?The Source data is downloaded and parsed using the Aggregated Live Feeds methodology to return information that can be served through ArcGIS Server as a map service or used to update Hosted Feature Services in Online or Enterprise.What can you do with this layer?This map service is suitable for data discovery and visualization. Identify features by clicking on the map to reveal the pre-configured pop-ups. View the time-enabled data using the time slider by Enabling Time Animation.This map is provided for informational purposes and is not monitored 24/7 for accuracy and currency.If you would like to be alerted to potential issues or simply see when this Service will update next, please visit our Live Feed Status Page!

National Digital Forecast Database (NDFD) MetadataThe National Digital Forecast Database (NDFD) Web Services provide a set of gridded weather forecasts for various sensible weather elements in near real-time. These forecasts are generated by a collaboration between the National Weather Service (NWS) field offices and the National Centers for Environmental Prediction (NCEP). The NDFD Web Services offer a seamless, digital mosaic of weather forecasts that can be accessed by users to obtain up-to-date information on a variety of weather conditions.The NDFD's forecasts are gridded, meaning they cover large geographic areas with weather data at specific intervals, providing high-resolution, geographically distributed forecasts. These forecasts can include temperature, precipitation, wind speed and direction, cloud cover, and other meteorological parameters.These web services are hosted by the Office of Dissemination’s CloudGIS team, which ensures the forecasts are readily accessible and deliverable over the internet. Users, including meteorologists, developers, and anyone interested in weather data, can query these web services for up-to-date forecasts in a digital format, enabling integration into applications, websites, and other platforms.NDFD’s Web Services Descriptions:12-Hour Probability of Precipitation Web Service's data layer is the likelihood, expressed as a percent, of a measurable precipitation event (1/100th of an inch or more) at a grid point during the 12-hour valid period. The 12-hour valid periods begin and end at 0000 and 1200 Coordinated Universal Time (UTC).Apparent Temperature Web Service: contains data that is the perceived temperature derived from either a combination of temperature and wind (Wind Chill) or temperature and humidity (Heat Index) for the indicated hour. When the temperature at a particular grid point falls to 50 F or less, wind chill will be used for that point for the Apparent Temperature. When the temperature at a grid point rises above 80 F, the heat index will be used for Apparent Temperature. Between 51 and 80 F, the Apparent Temperature will be the ambient air temperature.Dew Point Temperature Web Service's data is the expected dew point temperature for the indicated hour. Dew point temperature is a measure of atmospheric moisture. It is the temperature to which air must be cooled in order to reach saturation (assuming air pressure and moisture content are constant).Maximum Temperature Web Service's data is the daytime maximum temperature observed from 7 AM to 7PM LST.Minimum Temperature Web Service's data is predicted minimum temperature for a specific location at a given time, allowing users to visualize the lowest expected temperatures across a geographical area.Precipitation Amount Web Service's data is the expected quantity of liquid precipitation accumulated over a six-hourly period. A quantitative precipitation forecast (QPF) will be specified when a measurable (1/100th of an inch or more) precipitation type is forecast for any hour during a QPF valid period. NDFD valid periods for QPF are 6 hours long beginning and ending at 0000, 0600, 1200 and 1800 UTC. QPF includes the liquid equivalent amount for snow and ice.Relative Humidity Web Service's data is a ratio, expressed as a percent, of the amount of atmospheric moisture present relative to the amount that would be present if the air were saturated. Since the latter amount is dependent on temperature, relative humidity is a function of both moisture content and temperature.Sky Cover Web Service’s data is the predicted percentage of the sky that will be covered by opaque clouds at a given time, provided by the National Digital Forecast Database (NDFD). It is a forecast of how much of the sky will be obscured by clouds, expressed as a percentage value.Snow Amount Web Service's data is the expected total accumulation of new snow during a 6-hour period. A snow accumulation grid will be specified whenever a measurable snowfall is forecast for any hour during a valid period. Valid periods for the NDFD begin and end at 0600, 1200, 1800, and 0000 UTC.Temperature Web Service: contains data that is the expected temperature in degrees Fahrenheit valid for the indicated hour.Wave Height Web Service's data is the average height (from trough to crest) of the one-third highest waves valid for the top of the designated hour. Wave Height is a combination of wind waves and swell.Wind Direction Web Service's data is the expected sustained 10-meter wind direction for the indicated hour, using 36 points of a compass.Wind Gust Web Service's data is the maximum 3-second wind speed forecast to occur within a 2-minute interval at a height of 10 meters. Wind gust forecasts are valid at the top of the indicated hour.Wind Speed Web Service's data is the expected sustained 10-meter sustained wind speed for the indicated hour.Wind Speed and Direction Web Service's data is the expected sustained 10-meter wind direction for the indicated hour, using 36 points of a compass. Wind Speed is the expected sustained 10-meter sustained wind speed for the indicated hour. Wind barbs (shown below) are used to denote wind speed and direction.Update Frequency: The data in these service updates hourly. (Click here to see specific Valid Times for update Frequency)Link to graphical web page: https://digital.weather.govLink to data download (grib2): https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/Link to metadataQuestions/Concerns about the service, please contact the DISS GIS teamTime Information:These web services are time-enabled, meaning that each individual layer contains time-varying data and can be utilized by clients capable of making map requests that include a time component.These particular services can be queried with or without the use of a time component. If the time parameter is specified in a request, the data or imagery most relevant to the provided time value, if any, will be returned. If the time parameter is not specified in a request, the latest data or imagery valid for the present system time will be returned to the client. If the time parameter is not specified and no data or imagery is available for the present time, no data will be returned.Valid Time Table:ServiceValid Time12-Hour Probability of Precipitation Web ServiceThe 12-hour valid periods begin and end at 0000 and 1200 Coordinated Universal Time (UTC).Apparent Temperature Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Dew Point Temperature Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Maximum Temperature Web ServiceDisplay 0z every dayMinimum Temperature Web ServiceDisplay at 12z every dayPrecipitation Amount Web ServiceCONUS/OCONUS (forecast is valid at 0z,6z,12z and 18z)Relative Humidity Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Sky Cover Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Snow Amount Web ServiceCONUS/OCONUS (forecast is valid at 0z,6z,12z and 18z)Temperature Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Wave Height Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Wind Direction Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Wind Gust Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Wind SpeedCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Wind Speed and Direction Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)

This map displays projected visible surface smoke across the contiguous United States for the next 48 hours in 1 hour increments. It is updated every 24 hours by NWS. Concentrations are reported in micrograms per cubic meter.Where is the data coming from?The National Digital Guidance Database (NDGD) is a sister to the National Digital Forecast Database (NDFD). Information in NDGD may be used by NWS forecasters as guidance in preparing official NWS forecasts in NDFD. The experimental/guidance NDGD data is not an official NWS forecast product.Source: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndgd/GT.aq/AR.conus/ds.smokes01.binSource data archive can be found here: https://www.ncei.noaa.gov/products/weather-climate-models/national-digital-guidance-database look for 'LXQ...' files by date. These are the Binary GRIB2 files that can be decoded via DeGRIB tool.Where can I find other NDGD data?The Source data is downloaded and parsed using the Aggregated Live Feeds methodology to return information that can be served through ArcGIS Server as a map service or used to update Hosted Feature Services in Online or Enterprise.What can you do with this layer?This map service is suitable for data discovery and visualization. Identify features by clicking on the map to reveal the pre-configured pop-ups. View the time-enabled data using the time slider by Enabling Time Animation.RevisionsJuly 11, 2022: Feed updated to leverage forecast model change by NOAA, whereby the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) forecast model system was replaced with the Rapid Refresh (RAP) forecast model system. Key differences: higher accuracy with RAP now concentrated at 0-8 meter detail vs HYSPLIT at 0-100 meter; earlier data delivery by 6 hrs; forecast output extended to 51 hrs.This map is provided for informational purposes and is not monitored 24/7 for accuracy and currency.If you would like to be alerted to potential issues or simply see when this Service will update next, please visit our Live Feed Status Page!

National Digital Forecast Database (NDFD) MetadataThe National Digital Forecast Database (NDFD) Web Services provide a set of gridded weather forecasts for various sensible weather elements in near real-time. These forecasts are generated by a collaboration between the National Weather Service (NWS) field offices and the National Centers for Environmental Prediction (NCEP). The NDFD Web Services offer a seamless, digital mosaic of weather forecasts that can be accessed by users to obtain up-to-date information on a variety of weather conditions.The NDFD's forecasts are gridded, meaning they cover large geographic areas with weather data at specific intervals, providing high-resolution, geographically distributed forecasts. These forecasts can include temperature, precipitation, wind speed and direction, cloud cover, and other meteorological parameters.These web services are hosted by the Office of Dissemination’s CloudGIS team, which ensures the forecasts are readily accessible and deliverable over the internet. Users, including meteorologists, developers, and anyone interested in weather data, can query these web services for up-to-date forecasts in a digital format, enabling integration into applications, websites, and other platforms.NDFD’s Web Services Descriptions:12-Hour Probability of Precipitation Web Service's data layer is the likelihood, expressed as a percent, of a measurable precipitation event (1/100th of an inch or more) at a grid point during the 12-hour valid period. The 12-hour valid periods begin and end at 0000 and 1200 Coordinated Universal Time (UTC).Apparent Temperature Web Service: contains data that is the perceived temperature derived from either a combination of temperature and wind (Wind Chill) or temperature and humidity (Heat Index) for the indicated hour. When the temperature at a particular grid point falls to 50 F or less, wind chill will be used for that point for the Apparent Temperature. When the temperature at a grid point rises above 80 F, the heat index will be used for Apparent Temperature. Between 51 and 80 F, the Apparent Temperature will be the ambient air temperature.Dew Point Temperature Web Service's data is the expected dew point temperature for the indicated hour. Dew point temperature is a measure of atmospheric moisture. It is the temperature to which air must be cooled in order to reach saturation (assuming air pressure and moisture content are constant).Maximum Temperature Web Service's data is the daytime maximum temperature observed from 7 AM to 7PM LST.Minimum Temperature Web Service's data is predicted minimum temperature for a specific location at a given time, allowing users to visualize the lowest expected temperatures across a geographical area.Precipitation Amount Web Service's data is the expected quantity of liquid precipitation accumulated over a six-hourly period. A quantitative precipitation forecast (QPF) will be specified when a measurable (1/100th of an inch or more) precipitation type is forecast for any hour during a QPF valid period. NDFD valid periods for QPF are 6 hours long beginning and ending at 0000, 0600, 1200 and 1800 UTC. QPF includes the liquid equivalent amount for snow and ice.Relative Humidity Web Service's data is a ratio, expressed as a percent, of the amount of atmospheric moisture present relative to the amount that would be present if the air were saturated. Since the latter amount is dependent on temperature, relative humidity is a function of both moisture content and temperature.Sky Cover Web Service’s data is the predicted percentage of the sky that will be covered by opaque clouds at a given time, provided by the National Digital Forecast Database (NDFD). It is a forecast of how much of the sky will be obscured by clouds, expressed as a percentage value.Snow Amount Web Service's data is the expected total accumulation of new snow during a 6-hour period. A snow accumulation grid will be specified whenever a measurable snowfall is forecast for any hour during a valid period. Valid periods for the NDFD begin and end at 0600, 1200, 1800, and 0000 UTC.Temperature Web Service: contains data that is the expected temperature in degrees Fahrenheit valid for the indicated hour.Wave Height Web Service's data is the average height (from trough to crest) of the one-third highest waves valid for the top of the designated hour. Wave Height is a combination of wind waves and swell.Wind Direction Web Service's data is the expected sustained 10-meter wind direction for the indicated hour, using 36 points of a compass.Wind Gust Web Service's data is the maximum 3-second wind speed forecast to occur within a 2-minute interval at a height of 10 meters. Wind gust forecasts are valid at the top of the indicated hour.Wind Speed Web Service's data is the expected sustained 10-meter sustained wind speed for the indicated hour.Wind Speed and Direction Web Service's data is the expected sustained 10-meter wind direction for the indicated hour, using 36 points of a compass. Wind Speed is the expected sustained 10-meter sustained wind speed for the indicated hour. Wind barbs (shown below) are used to denote wind speed and direction.Update Frequency: The data in these service updates hourly. (Click here to see specific Valid Times for update Frequency)Link to graphical web page: https://digital.weather.govLink to data download (grib2): https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/Link to metadataQuestions/Concerns about the service, please contact the DISS GIS teamTime Information:These web services are time-enabled, meaning that each individual layer contains time-varying data and can be utilized by clients capable of making map requests that include a time component.These particular services can be queried with or without the use of a time component. If the time parameter is specified in a request, the data or imagery most relevant to the provided time value, if any, will be returned. If the time parameter is not specified in a request, the latest data or imagery valid for the present system time will be returned to the client. If the time parameter is not specified and no data or imagery is available for the present time, no data will be returned.Valid Time Table:ServiceValid Time12-Hour Probability of Precipitation Web ServiceThe 12-hour valid periods begin and end at 0000 and 1200 Coordinated Universal Time (UTC).Apparent Temperature Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Dew Point Temperature Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Maximum Temperature Web ServiceDisplay 0z every dayMinimum Temperature Web ServiceDisplay at 12z every dayPrecipitation Amount Web ServiceCONUS/OCONUS (forecast is valid at 0z,6z,12z and 18z)Relative Humidity Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Sky Cover Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Snow Amount Web ServiceCONUS/OCONUS (forecast is valid at 0z,6z,12z and 18z)Temperature Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Wave Height Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Wind Direction Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Wind Gust Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Wind SpeedCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)Wind Speed and Direction Web ServiceCONUS displays every hourOCONUS displays every 3 hours (3z,6z,9z,12z etc.)

This map displays the minimum and maximum air temperature forecast over the next 3 days across the Contiguous United States, Alaska, Guam, Hawaii, and Puerto Rico in daily increments. Minimum temperatures are typically at night, while maximum temperatures are typically afternoon. The original raster data has been processed into 1-degree contours and both Layers include a Time Series set to a 24-hour time interval.The minimum and maximum temperatures are the forecasted ambient air temperature in °F.See sister data product for Apparent and Expected Hourly TemperaturesRevisionsApr 21, 2022: Added Forecast Period Number 'Interval' field for an alternate query method to the Timeline of data.Apr 22, 2022: Set 'Min Temperature' layer visibility to False by default, so only Max temperature is visible when initially viewed.Sep 1, 2022: Updated renderer Arcade logic on layers to correctly symbolize on values greater than 120 and less than -60 degrees.DetailService Data update interval is: HourlyWhere is the data coming from?The National Digital Forecast Database (NDFD) was designed to provide access to weather forecasts in digital form from a central location. The NDFD produces gridded forecasts of sensible weather elements. NDFD contains a seamless mosaic of digital forecasts from National Weather Service (NWS) field offices working in collaboration with the National Centers for Environmental Prediction (NCEP). All of these organizations are under the administration of the National Oceanic and Atmospheric Administration (NOAA).Overnight Minimum Temperature Source:CONUS: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.conus/VP.001-003/ds.mint.binALASKA: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.alaska/VP.001-003/ds.mint.binHAWAII: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.hawaii/VP.001-003/ds.mint.binGUAM: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.guam/VP.001-003/ds.mint.binPUERTO RICO: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.puertori/VP.001-003/ds.mint.binDaytime Maximum Temperature Source:CONUS: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.conus/VP.001-003/ds.maxt.binALASKA: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.alaska/VP.001-003/ds.maxt.binHAWAII: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.hawaii/VP.001-003/ds.maxt.binGUAM: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.guam/VP.001-003/ds.maxt.binPUERTO RICO: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.puertori/VP.001-003/ds.maxt.binWhere can I find other NDFD data?The Source data is downloaded and parsed using the Aggregated Live Feeds methodology to return information that can be served through ArcGIS Server as a map service or used to update Hosted Feature Services in Online or Enterprise.What can you do with this layer?This feature service is suitable for data discovery and visualization. Identify features by clicking on the map to reveal the pre-configured pop-ups. View the time-enabled data using the time slider by Enabling Time Animation.This map is provided for informational purposes and is not monitored 24/7 for accuracy and currency.If you would like to be alerted to potential issues or simply see when this Service will update next, please visit our Live Feed Status Page.

This map displays the Apparent and Expected Air Temperature forecast over the next 72 hours across the Contiguous United States, Alaska, Guam, Hawaii, and Puerto Rico in 3 hour increments. The original raster data has been processed into 1-degree contours.Two layers are included: apparent and expected temperature, both include a Time Series set to a 3-hour time interval. The apparent temperature is the perceived (or feels like) temperature derived from either a combination of temperature and wind (wind chill) or temperature and humidity (heat index) for the indicated hour. When the temperature at a particular grid point falls to 50 °F or less, wind chill will be used for that point for the apparent temperature. When the temperature at a grid point rises above 80 °F, the heat index will be used for apparent temperature.
Between 51 and 80 °F, the apparent temperature will be the ambient air temperature.The expected temperature is the forecasted ambient air temperature in °F.See sister data product for Min and Max Daily TemperaturesRevisionsApr 21, 2022: Added Forecast Period Number 'Interval' field for an alternate query method to the Timeline of data. Disabled Time Series by default to improve initial Map Viewer exprience and added a Filter for 'interval = 1' to display initial forecast time data (current time period).Apr 22, 2022: Set 'Apparent Temperature' layer visibility to True by default, so content is visible when initially viewed.Sep 1, 2022: Updated renderer Arcade logic on layers to correctly symbolize on values greater than 120 and less than -60 degrees.DetailService Data update interval is: HourlyWhere is the data coming from?The National Digital Forecast Database (NDFD) was designed to provide access to weather forecasts in digital form from a central location. The NDFD produces gridded forecasts of sensible weather elements. NDFD contains a seamless mosaic of digital forecasts from National Weather Service (NWS) field offices working in collaboration with the National Centers for Environmental Prediction (NCEP). All of these organizations are under the administration of the National Oceanic and Atmospheric Administration (NOAA).Apparent Temperature Source:CONUS: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.conus/VP.001-003/ds.apt.binALASKA: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.alaska/VP.001-003/ds.apt.binHAWAII: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.hawaii/VP.001-003/ds.apt.binGUAM: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.guam/VP.001-003/ds.apt.binPUERTO RICO: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.puertori/VP.001-003/ds.apt.binExpected Temperature Source:CONUS: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.conus/VP.001-003/ds.temp.binALASKA: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.alaska/VP.001-003/ds.temp.binHAWAII: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.hawaii/VP.001-003/ds.temp.binGUAM: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.guam/VP.001-003/ds.temp.binPUERTO RICO: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.puertori/VP.001-003/ds.temp.binWhere can I find other NDFD data?The Source data is downloaded and parsed using the Aggregated Live Feeds methodology to return information that can be served through ArcGIS Server as a map service or used to update Hosted Feature Services in Online or Enterprise.What can you do with this layer?This feature service is suitable for data discovery and visualization. Identify features by clicking on the map to reveal the pre-configured pop-ups. View the time-enabled data using the time slider by Enabling Time Animation or add a Filter using the 'Forecast Period Number'.This map is provided for informational purposes and is not monitored 24/7 for accuracy and currency.If you would like to be alerted to potential issues or simply see when this Service will update next, please visit our Live Feed Status Page.

This map displays the Apparent and Expected Air Temperature forecast over the next 72 hours across the Contiguous United States, Alaska, Guam, Hawaii, and Puerto Rico in 3 hour increments. The original raster data has been processed into 1-degree contours.Two layers are included: apparent and expected temperature, both include a Time Series set to a 3-hour time interval. The apparent temperature is the perceived (or feels like) temperature derived from either a combination of temperature and wind (wind chill) or temperature and humidity (heat index) for the indicated hour. When the temperature at a particular grid point falls to 50 °F or less, wind chill will be used for that point for the apparent temperature. When the temperature at a grid point rises above 80 °F, the heat index will be used for apparent temperature.
Between 51 and 80 °F, the apparent temperature will be the ambient air temperature.The expected temperature is the forecasted ambient air temperature in °F.See sister data product for Min and Max Daily TemperaturesRevisionsApr 21, 2022: Added Forecast Period Number 'Interval' field for an alternate query method to the Timeline of data. Disabled Time Series by default to improve initial Map Viewer exprience and added a Filter for 'interval = 1' to display initial forecast time data (current time period).Apr 22, 2022: Set 'Apparent Temperature' layer visibility to True by default, so content is visible when initially viewed.Sep 1, 2022: Updated renderer Arcade logic on layers to correctly symbolize on values greater than 120 and less than -60 degrees.DetailService Data update interval is: HourlyWhere is the data coming from?The National Digital Forecast Database (NDFD) was designed to provide access to weather forecasts in digital form from a central location. The NDFD produces gridded forecasts of sensible weather elements. NDFD contains a seamless mosaic of digital forecasts from National Weather Service (NWS) field offices working in collaboration with the National Centers for Environmental Prediction (NCEP). All of these organizations are under the administration of the National Oceanic and Atmospheric Administration (NOAA).Apparent Temperature Source:CONUS: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.conus/VP.001-003/ds.apt.binALASKA: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.alaska/VP.001-003/ds.apt.binHAWAII: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.hawaii/VP.001-003/ds.apt.binGUAM: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.guam/VP.001-003/ds.apt.binPUERTO RICO: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.puertori/VP.001-003/ds.apt.binExpected Temperature Source:CONUS: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.conus/VP.001-003/ds.temp.binALASKA: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.alaska/VP.001-003/ds.temp.binHAWAII: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.hawaii/VP.001-003/ds.temp.binGUAM: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.guam/VP.001-003/ds.temp.binPUERTO RICO: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.puertori/VP.001-003/ds.temp.binWhere can I find other NDFD data?The Source data is downloaded and parsed using the Aggregated Live Feeds methodology to return information that can be served through ArcGIS Server as a map service or used to update Hosted Feature Services in Online or Enterprise.What can you do with this layer?This feature service is suitable for data discovery and visualization. Identify features by clicking on the map to reveal the pre-configured pop-ups. View the time-enabled data using the time slider by Enabling Time Animation or add a Filter using the 'Forecast Period Number'.This map is provided for informational purposes and is not monitored 24/7 for accuracy and currency.If you would like to be alerted to potential issues or simply see when this Service will update next, please visit our Live Feed Status Page.

This map displays projected visible surface smoke across the contiguous United States for the next 48 hours in 1 hour increments. It is updated every 24 hours by NWS. Concentrations are reported in micrograms per cubic meter.Where is the data coming from?The National Digital Guidance Database (NDGD) is a sister to the National Digital Forecast Database (NDFD). Information in NDGD may be used by NWS forecasters as guidance in preparing official NWS forecasts in NDFD. The experimental/guidance NDGD data is not an official NWS forecast product.Source: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndgd/GT.aq/AR.conus/ds.smokes01.binSource data archive can be found here: https://www.ncei.noaa.gov/products/weather-climate-models/national-digital-guidance-database look for 'LXQ...' files by date. These are the Binary GRIB2 files that can be decoded via DeGRIB tool.Where can I find other NDGD data?The Source data is downloaded and parsed using the Aggregated Live Feeds methodology to return information that can be served through ArcGIS Server as a map service or used to update Hosted Feature Services in Online or Enterprise.What can you do with this layer?This map service is suitable for data discovery and visualization. Identify features by clicking on the map to reveal the pre-configured pop-ups. View the time-enabled data using the time slider by Enabling Time Animation.RevisionsJuly 11, 2022: Feed updated to leverage forecast model change by NOAA, whereby the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) forecast model system was replaced with the Rapid Refresh (RAP) forecast model system. Key differences: higher accuracy with RAP now concentrated at 0-8 meter detail vs HYSPLIT at 0-100 meter; earlier data delivery by 6 hrs; forecast output extended to 51 hrs.This map is provided for informational purposes and is not monitored 24/7 for accuracy and currency.If you would like to be alerted to potential issues or simply see when this Service will update next, please visit our Live Feed Status Page!

This map displays the forecasted wind gust over the next 72 hours across the contiguous United States. Wind Gust is the maximum 3-second wind speed (in knots) forecast to occur within a 2-minute interval at a height of 10 meters Above Ground Level (AGL). Wind gust forecasts are valid at the top of the indicated hour. Data are updated hourly from the National Digital Forecast Database (NDFD) produced by the National Weather Service.Where is the data coming from?The National Digital Forecast Database (NDFD) was designed to provide access to weather forecasts in digital form from a central location. The NDFD produces gridded forecasts of sensible weather elements. NDFD contains a seamless mosaic of digital forecasts from National Weather Service (NWS) field offices working in collaboration with the National Centers for Environmental Prediction (NCEP). All of these organizations are under the administration of the National Oceanic and Atmospheric Administration (NOAA). Source: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.conus/VP.001-003/ds.wgust.binWhere can I find other NDFD data?The Source data is downloaded and parsed using the Aggregated Live Feeds methodology to return information that can be served through ArcGIS Server as a map service or used to update Hosted Feature Services in Online or Enterprise.What can you do with this layer?This map service is suitable for data discovery and visualization. Identify features by clicking on the map to reveal the pre-configured pop-ups. View the time-enabled data using the time slider by Enabling Time Animation.This map is provided for informational purposes and is not monitored 24/7 for accuracy and currency.If you would like to be alerted to potential issues or simply see when this Service will update next, please visit our Live Feed Status Page!

National Digital Forecast Database (NDFD) Metadata

The National Digital Forecast Database (NDFD) Web Services provide a set of gridded weather forecasts for various sensible weather elements in near real-time. These forecasts are generated by a collaboration between the National Weather Service (NWS) field offices and the National Centers for Environmental Prediction (NCEP). The NDFD Web Services offer a seamless, digital mosaic of weather forecasts that can be accessed by users to obtain up-to-date information on a variety of weather conditions.

The NDFD's forecasts are gridded, meaning they cover large geographic areas with weather data at specific intervals, providing high-resolution, geographically distributed forecasts. These forecasts can include temperature, precipitation, wind speed and direction, cloud cover, and other meteorological parameters.

These web services are hosted by the Office of Dissemination’s CloudGIS team, which ensures the forecasts are readily accessible and deliverable over the internet. Users, including meteorologists, developers, and anyone interested in weather data, can query these web services for up-to-date forecasts in a digital format, enabling integration into applications, websites, and other platforms.

NDFD’s Web Services Descriptions:

12-Hour Probability of Precipitation Web Service's data layer is the likelihood, expressed as a percent, of a measurable precipitation event (1/100th of an inch or more) at a grid point during the 12-hour valid period. The 12-hour valid periods begin and end at 0000 and 1200 Coordinated Universal Time (UTC).

Apparent Temperature Web Service: contains data that is the perceived temperature derived from either a combination of temperature and wind (Wind Chill) or temperature and humidity (Heat Index) for the indicated hour. When the temperature at a particular grid point falls to 50 F or less, wind chill will be used for that point for the Apparent Temperature. When the temperature at a grid point rises above 80 F, the heat index will be used for Apparent Temperature. Between 51 and 80 F, the Apparent Temperature will be the ambient air temperature.

Dew Point Temperature Web Service's data is the expected dew point temperature for the indicated hour. Dew point temperature is a measure of atmospheric moisture. It is the temperature to which air must be cooled in order to reach saturation (assuming air pressure and moisture content are constant).

Maximum Temperature Web Service's data is the daytime maximum temperature observed from 7 AM to 7PM LST.

Minimum Temperature Web Service's data is predicted minimum temperature for a specific location at a given time, allowing users to visualize the lowest expected temperatures across a geographical area.

Precipitation Amount Web Service's data is the expected quantity of liquid precipitation accumulated over a six-hourly period. A quantitative precipitation forecast (QPF) will be specified when a measurable (1/100th of an inch or more) precipitation type is forecast for any hour during a QPF valid period. NDFD valid periods for QPF are 6 hours long beginning and ending at 0000, 0600, 1200 and 1800 UTC. QPF includes the liquid equivalent amount for snow and ice.

Relative Humidity Web Service's data is a ratio, expressed as a percent, of the amount of atmospheric moisture present relative to the amount that would be present if the air were saturated. Since the latter amount is dependent on temperature, relative humidity is a function of both moisture content and temperature.

Sky Cover Web Service’s data is the predicted percentage of the sky that will be covered by opaque clouds at a given time, provided by the National Digital Forecast Database (NDFD). It is a forecast of how much of the sky will be obscured by clouds, expressed as a percentage value.

Snow Amount Web Service's data is the expected total accumulation of new snow during a 6-hour period. A snow accumulation grid will be specified whenever a measurable snowfall is forecast for any hour during a valid period. Valid periods for the NDFD begin and end at 0600, 1200, 1800, and 0000 UTC.

Temperature Web Service: contains data that is the expected temperature in degrees Fahrenheit valid for the indicated hour.

Wave Height Web Service's data is the average height (from trough to crest) of the one-third highest waves valid for the top of the designated hour. Wave Height is a combination of wind waves and swell.

Wind Direction Web Service's data is the expected sustained 10-meter wind direction for the indicated hour, using 36 points of a compass.

Wind Gust Web Service's data is the maximum 3-second wind speed forecast to occur within a 2-minute interval at a height of 10 meters. Wind gust forecasts are valid at the top of the indicated hour.

Wind Speed Web Service's data is the expected sustained 10-meter sustained wind speed for the indicated hour.

Wind Speed and Direction Web Service's data is the expected sustained 10-meter wind direction for the indicated hour, using 36 points of a compass. Wind Speed is the expected sustained 10-meter sustained wind speed for the indicated hour. Wind barbs (shown below) are used to denote wind speed and direction.

Update Frequency: The data in these service updates hourly. (Click here to see specific Valid Times for update Frequency)

Link to graphical web page: https://digital.weather.gov

Link to data download (grib2): https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/

Link to metadata

Questions/Concerns about the service, please contact the DISS GIS team

Time Information:

These web services are time-enabled, meaning that each individual layer contains time-varying data and can be utilized by clients capable of making map requests that include a time component.

These particular services can be queried with or without the use of a time component. If the time parameter is specified in a request, the data or imagery most relevant to the provided time value, if any, will be returned. If the time parameter is not specified in a request, the latest data or imagery valid for the present system time will be returned to the client. If the time parameter is not specified and no data or imagery is available for the present time, no data will be returned.

Valid Time Table:

Service

Valid Time

12-Hour Probability of Precipitation Web Service

The 12-hour valid periods begin and end at 0000 and 1200 Coordinated Universal Time (UTC).

Apparent Temperature Web Service

CONUS displays every hour OCONUS displays every 3 hours (3z,6z,9z,12z etc.)

Dew Point Temperature Web Service

CONUS displays every hour OCONUS displays every 3 hours (3z,6z,9z,12z etc.)

Maximum Temperature Web Service

Display 0z every day

Minimum Temperature Web Service

Display at 12Z every day

Precipitation Amount Web Service

CONUS/OCONUS (forecast is valid at 0z,6z,12z and 18z)

Relative Humidity Web Service

CONUS displays every hour OCONUS displays every 3 hours (3z,6z,9z,12z etc.)

Sky Cover Web Service

CONUS displays every hour OCONUS displays every 3 hours (3z,6z,9z,12z etc.)

Snow Amount Web Service

CONUS/OCONUS (forecast is valid at 0z,6z,12z and 18z)

Temperature Web Service

CONUS displays every hour OCONUS displays every 3 hours (3z,6z,9z,12z etc.)

Wave Height Web Service

CONUS displays every hour OCONUS displays every 3 hours (3z,6z,9z,12z etc.)

Wind Direction Web Service

CONUS displays every hour OCONUS displays every 3 hours (3z,6z,9z,12z etc.)

Wind Gust Web Service

CONUS displays every hour OCONUS displays every 3 hours (3z,6z,9z,12z etc.)

Wind Speed

CONUS displays every hour OCONUS displays every 3 hours (3z,6z,9z,12z etc.)

Wind Speed and Direction Web Service

CONUS displays every hour OCONUS displays every 3 hours (3z,6z,9z,12z etc.)