This GIS grid atlas contains precipitation frequency estimates for California based on precipitation data collected between 1850-2010. This atlas is an updated version of volume XI (California) of NOAA Atlas 2, published in 1973 and volume 1 of NOAA Atlas 14 (Semiarid Southwest), published in 2006. The grids provide information for durations from 5 minutes through 60 days, and for return periods of 1 year through 1000 years. All grids are in geographic coordinate system (NAD83 horizontal datum) and units are in 1000th of inches. The grid data also contains estimates for Semiarid Southwest from NOAA Atlas 14 Volume 1 Version 5. Please see the metadata page for the Semiarid Southwest portion of the grid.

This GIS grid atlas contains precipitation frequency estimates for the Northeastern states based on precipitation data collected between 1816-2014. This atlas supersedes information in Technical Memorandum NWS Hydro 35, published in 1977, Technical Paper 40, published in 1961, and Technical Paper 49,published in 1964. The grids provide information for durations from 5 minutes through 60 days, and for return periods of 1 year through 1000 years. All grids are in geographic coordinate system (NAD83 horizontal datum) and units are in 1000th of inches.

This resource demonstrates the steps for assessing post-storm rainfall severity for Hurricane Helene by comparing observed rainfall data to NOAA Atlas 14 datasets as part of the "Precipitation Frequency and Storm Analysis in Operational Hydrology" module. It includes a Python notebook that guides learners through examining observed rainfall, comparing it to historical data for various return periods, and evaluating the accuracy of HRRR forecasts. The activity focuses on rainfall from September 24–27, 2024. This resource was developed January 2025 as part of a CIROH HydroLearn Hackathon.

This GIS grid atlas contains precipitation frequency estimates for Southeastern states based on precipitation data collected between 1840-2013. This atlas supersedes information in Technical Memorandum NWS Hydro 35, published in 1977, Technical Paper 40, published in 1961, and Technical Paper 49,published in 1964. The grids provide information for durations from 5 minutes through 60 days, and for return periods of 1 year through 1000 years. All grids are in geographic coordinate system (NAD84 horizontal datum) and units are in 1000th of inches.

This GIS grid atlas contains precipitation frequency estimates for the Ohio River Basin and Surrounding states is based on precipitation data collected between 4/1863-12/2000. This atlas is an updated version of Technical Memorandum NWS Hydro 35, Five to 60-minutes Precipitation Frequency for Eastern and Central United States (1977), Technical Paper 40 - Rainfall Frequency Atlas of the United States for Durations from 30 minutes to 24 hours and Return Periods from 1 to 100 Years (1961) and Technical Paper 49 - Two-to-Ten-Day Precipitation for Return Periods of 2 to 100 Years in the Contiguous United States (1964) for the following states: Delaware, District of Columbia, Illinois, Indiana, Kentucky, Maryland, New Jersey, North Carolina, Ohio, Pennsylvania, South Carolina, Tennessee, Virginia and West Virginia. The grids provide information for durations from 5 minutes through 60 days, and for return periods of 2 years through 1000 years. All grids are in geographic coordinate system (WGS72 horizontal datum) and units are in 1000th of inches.

This GIS grid atlas contains precipitation frequency estimates for the Semiarid Southwest based on precipitation data collected between 1893-2000. This atlas is an updated version of volumes IV (New Mexico), VI (Utah), VII Nevada), VIII (Arizona), published in 1973. The grids provide information for durations from 5 minutes through 60 days, and for return periods of 1 year through 1000 years. All grids are in geographic coordinate system (NAD84 horizontal datum) and units are in 1000th of inches. The grid data also contains estimates for California from NOAA Atlas 14 Volume 6 Version 2. Please see the metadata page for the California portion of the grid.

This GIS grid atlas contains precipitation frequency estimates for the Pacific Islands that are based on precipitation data. This atlas is a new release from the NWS and does not update any other publication. The precipitation frequency grids are available for durations from 5 minutes through 60 days, and for average recurrence intervals of 1 year through 1,000 years. All grids are in geographic coordinate system (WGS84 horizontal datum) and units are in 1000th of inches. AMS and PDS results are provided; refer to published documentation for differences between the two.

This GIS grid atlas contains precipitation frequency estimates for the Hawaiian Islands is based on precipitation data collected between 1/1905-12/2005. This atlas is an update to Technical Paper No. 43 'Rainfall-Frequency Atlas of the Hawaiian Islands for Areas to 200 Square Miles, Durations to 24 Hours, and Return Periods from 1 to 100 Years' (U.S. Weather Bureau, 1962) and Technical Paper No. 51 'Two- to Ten-Day Rainfall for Return Periods of 2 to 100 Years in the Hawaiian Islands' (U.S. Weather Bureau, 1965). The grids provide information for durations from 5 minutes through 60 days, and for average recurrence intervals of 1 year through 1,000 years. All grids are in geographic coordinate system (WGS72 horizontal datum) and units are in 1000th of inches.

This GIS grid atlas contains precipitation frequency estimates for the Pacific Islands that are based on precipitation data. This atlas is a new release from the NWS and does not update any other publication. The precipitation frequency grids are available for durations from 5 minutes through 60 days, and for average recurrence intervals of 1 year through 1,000 years. All grids are in geographic coordinate system (WGS84 horizontal datum) and units are in 1000th of inches. AMS and PDS results are provided; refer to published documentation for differences between the two.

This GIS grid atlas contains precipitation frequency estimates for the Pacific Islands that are based on precipitation data. This atlas is a new release from the NWS and does not update any other publication. The precipitation frequency grids are available for durations from 5 minutes through 60 days, and for average recurrence intervals of 1 year through 1,000 years. All grids are in geographic coordinate system (WGS84 horizontal datum) and units are in 1000th of inches. AMS and PDS results are provided; refer to published documentation for differences between the two.

This GIS grid atlas contains precipitation frequency estimates for Puerto Rico and the U.S. Virgin Islands is based on precipitation data collected between 1/1899-12/2004. This atlas is an updated version of Technical Paper 42 Generalized Estimates of Probable Maximum Precipitation and Rainfall-Frequency Data for Puerto Rico and Virgin Islands and Technical Paper 53, Two-to-Ten-Day Precipitation for Return Periods of 2 to 100 Years in Puerto Rico and Virgin Islands (1965). The grids provide information for durations from 5 minutes through 60 days, and for recurrence intervals of 1 year through 1000 years. All grids are in geographic coordinate system (WGS72 horizontal datum) and units are in 1000th of inches.

The South Florida Water Management District (SFWMD) and the U.S. Geological Survey have developed projected future change factors for precipitation depth-duration-frequency (DDF) curves at 174 NOAA Atlas 14 stations in central and south Florida. The change factors were computed as the ratio of projected future to historical extreme precipitation depths fitted to extreme precipitation data from various downscaled climate datasets using a constrained maximum likelihood (CML) approach. The change factors correspond to the period 2050-2089 (centered in the year 2070) as compared to the 1966-2005 historical period. A Microsoft Excel workbook is provided which tabulates fitted historical precipitation depths derived from the Multivariate Adaptive Constructed Analogs (MACA) dataset at grid cells closest to National Oceanic and Atmospheric Administration (NOAA) Atlas 14 stations in central and south Florida. The historical extreme precipitation depths are fitted to extreme precipitation data using a constrained maximum likelihood approach and tabulated by duration (1, 3, and 7 days) and return period (5, 10, 25, 50, 100, and 200 years).

The South Florida Water Management District (SFWMD) and the U.S. Geological Survey have developed projected future change factors for precipitation depth-duration-frequency (DDF) curves at 174 NOAA Atlas 14 stations in central and south Florida. The change factors were computed as the ratio of projected future to historical extreme precipitation depths fitted to extreme precipitation data from various downscaled climate datasets using a constrained maximum likelihood (CML) approach. The change factors correspond to the period 2050-2089 (centered in the year 2070) as compared to the 1966-2005 historical period. A Microsoft Excel workbook is provided which tabulates change factors derived from the Localized Constructed Analogues (LOCA) dataset at grid cells closest to National Oceanic and Atmospheric Administration (NOAA) Atlas 14 stations in central and south Florida. The change factors were computed as the ratio of projected future to historical precipitation depths fitted to extreme precipitation data using a constrained maximum likelihood approach. The change factors are tabulated by duration (1, 3, and 7 days) and return period (5, 10, 25, 50, 100, and 200 years).

The South Florida Water Management District (SFWMD) and the U.S. Geological Survey have developed projected future change factors for precipitation depth-duration-frequency (DDF) curves at 174 NOAA Atlas 14 stations in central and south Florida. The change factors were computed as the ratio of projected future to historical extreme precipitation depths fitted to extreme precipitation data from various downscaled climate datasets using a constrained maximum likelihood (CML) approach. The change factors correspond to the period 2050-2089 (centered in the year 2070) as compared to the 1966-2005 historical period. Geospatial data provided in an ArcGIS shapefile are described herein. The shapefile shows the locations of NOAA Atlas 14 stations in central and south Florida for which depth-duration-frequency curves and change factors of precipitation depths were developed as part of this project. For more information about the stations, see Table 1 of Datasets_station_information.xlsx.

This GIS grid atlas contains precipitation frequency estimates for the Pacific Islands that are based on precipitation data. This atlas is a new release from the NWS and does not update any other publication. The precipitation frequency grids are available for durations from 5 minutes through 60 days, and for average recurrence intervals of 1 year through 1,000 years. All grids are in geographic coordinate system (WGS84 horizontal datum) and units are in 1000th of inches. AMS and PDS results are provided; refer to published documentation for differences between the two.

This GIS grid atlas contains precipitation frequency estimates for the Pacific Islands that are based on precipitation data. This atlas is a new release from the NWS and does not update any other publication. The precipitation frequency grids are available for durations from 5 minutes through 60 days, and for average recurrence intervals of 1 year through 1,000 years. All grids are in geographic coordinate system (WGS84 horizontal datum) and units are in 1000th of inches. AMS and PDS results are provided; refer to published documentation for differences between the two.

This resource demonstrates the steps for analyzing HRRR rainfall forecasts during Hurricane Helene as part of the "Precipitation Frequency and Storm Analysis in Operational Hydrology" module. It includes a Python notebook designed to guide learners through plotting rainfall forecast series and comparing these forecasts to NOAA Atlas 14 data to assess forecast accuracy and identify potential risks for critical facilities.

The South Florida Water Management District (SFWMD) and the U.S. Geological Survey have developed projected future change factors for precipitation depth-duration-frequency (DDF) curves at 174 NOAA Atlas 14 stations in central and south Florida. The change factors were computed as the ratio of projected future to historical extreme precipitation depths fitted to extreme precipitation data from various downscaled climate datasets using a constrained maximum likelihood (CML) approach. The change factors correspond to the period 2050-2089 (centered in the year 2070) as compared to the 1966-2005 historical period. A Microsoft Excel workbook is provided which tabulates fitted historical precipitation depths derived from the Analog Resampling and Statistical Scaling Method by Jupiter Intelligence using the Weather Research and Forecasting Model (JupiterWRF) at grid cells closest to National Oceanic and Atmospheric Administration (NOAA) Atlas 14 stations in central and south Florida. The historical extreme precipitation depths are fitted to extreme precipitation data using a maximum likelihood approach and tabulated by duration (1 day) and return period (5, 10, 25, 50, 100, and 200 years).

The Florida Flood Hub for Applied Research and Innovation and the U.S. Geological Survey have developed projected future change factors for precipitation depth-duration-frequency (DDF) curves at 242 NOAA Atlas 14 stations in Florida. The change factors were computed as the ratio of projected future to historical extreme-precipitation depths fitted to extreme-precipitation data from downscaled climate datasets using a constrained maximum likelihood (CML) approach as described in https://doi.org/10.3133/sir20225093. The change factors correspond to the period 2038-42 (centered in the year 2040) as compared to the 1966-2005 historical period. A Microsoft Excel workbook is provided which tabulates projected future precipitation depths derived from the Analog Resampling and Statistical Scaling Method by Jupiter Intelligence using the Weather Research and Forecasting Model (JupiterWRF) at grid cells closest to National Oceanic and Atmospheric Administration (NOAA) Atlas 14 stations in Florida. A maximum likelihood approach is used to fit the projected future extreme-precipitation depths to extreme projected future precipitation data estimated using a statistical scaling approach. The return levels are modified to account for changes in the future frequency of large-scale meteorological factors conducive to precipitation by means of an analog resampling approach. The projected future extreme-precipitation depths are tabulated by duration (1 day) and return period (5, 10, 25, 50, 100, 200, and 500 years).

These isofluvials are based on GIS grid atlases containing precipitation frequency estimates for Puerto Rico and the U.S. Virgin Islands is based on precipitation data collected between 1/1899-12/2004. This atlas is an updated version of Technical Paper 42 Generalized Estimates of Probable Maximum Precipitation and Rainfall-Frequency Data for Puerto Rico and Virgin Islands and Technical Paper 53, Two-to-Ten-Day Precipitation for Return Periods of 2 to 100 Years in Puerto Rico and Virgin Islands (1965). The grid provides 24-hour average precipitation (in inches * 1000) for a 10-year recurrence interval.NOAA Atlas 14 Volume 13 Puerto Rico Grid Metadata: https://hdsc.nws.noaa.gov/hdsc/pfds/meta/na14_vol3_pr_grid_metadata.xml