Archive of volume data of all polarimetric radar variables, including those related to quality for the radar in Herwijnen. Time interval is 5 minutes. Data have been archived in one .tar file per day.

Climatological radar rainfall dataset of 5 minute precipitation depths at a 1-km grid, which have been adjusted employing validated and complete rain gauge data from both KNMI rain gauge networks. Same dataset as "RAD_NL25_RAC_MFBS_5min", except that now an Extended Mask (EM) has been applied to this dataset. As a result, data are also available up to tens of kilometers away from the land surface of the Netherlands, i.e. above Belgium, Germany, and above open water. This dataset is updated once a month providing data up to a few months ago.

Gridded files of radar-derived 5 minute precipitation accumulations, corrected by rain gauge data. Radar data over the Netherlands and surrounding area measured by Dutch, Belgian, and German radars are corrected by available data from automatic rain gauges. Time interval is 5 minutes. See data set nl_rdr_data_rtcor_5m_tar/1.0 for an archive that goes back to 2018. Starting with data from 31 January 2023 - 10.45 UTC onwards, this dataset is created using improved algorithms. This includes correction for signal attenuation, correction for vertical variation of precipitation, correction for fast-moving showers and use of uncertainty information in merging data from multiple radars.

Realtime 3D radar composite that covers a wide area over the Netherlands and its direct surroundings. The composite is constructed based on data from Dutch, Belgian and German radars. From the 3D composite, various products are derived, including maximum reflectivity (ZMAX), Vertically Integrated Liquid (VIL), Vertically Integrated Ice (VII) and hail parameters (MEHS and POSH).

Forecasts of radar reflectivities at 1500 m over the Netherlands and surrounding area measured by two radars in Herwijnen and Den Helder. Forecast interval is 5 minutes, with lead times up to 2 hours. This dataset is based on a very basic reflectivity composite. For a more advanced precipitation nowcast please use this dataset: https://dataplatform.knmi.nl/dataset/radar-forecast-2-0

Climatological radar rainfall dataset of 1 hour precipitation depths at a 1 km grid, which have been adjusted employing validated and complete rain gauge data from both KNMI rain gauge networks. This dataset is updated once a month providing data up to a few months ago.

The European climatological gauge-adjusted radar precipitation dataset, EURADCLIM, addresses the need for an accurate (sub-)daily precipitation product covering 8000000 square kilometers of Europe at high spatial resolution. It consists of 1-h and 24-h precipitation accumulations (every clock-hour) at a 2-km grid for the period 2013 through 2022. It is based on the European Meteorological Network (EUMETNET) Operational Program on the Exchange of weather RAdar Information (OPERA) gridded radar dataset of 15-min instantaneous surface rain rates. For EURADCLIM, first methods have been applied to further remove non-meteorological echoes from these images by applying two statistical methods and a satellite-based cloud type mask. Second, the radar composites are merged with the rain gauge data from the European Climate Assessment & Dataset (ECA&D) in order to substantially improve its quality. We expect to rerun EURADCLIM once a year over the entire period, using all available ECA&D rain gauge data, and extend it with one year of data. This will result in a new version of this dataset. Project EURADCLIM was financed by KNMI’s multi-annual strategic research programme (project number 2017.02). The EURADCLIM dataset is based on the OPERA surface radar rain rate and daily precipitation sums of the rain gauge networks provided by the European national weather services and other data holding institutes, through ECA&D. With respect to version 1, the changes include slightly improved removal of non-meteorological echoes, somewhat better rain gauge coverage over the years 2013 to 2020, and years 2021 and 2022 have been added to the dataset. Usage: For each month a zip file is provided. The data are in UTC, where the time in the unzipped filenames is the end time of observation in UTC. Object "dataset1/data1" contains the 24-h precipitation accumulation in millimeters. For a given grid cell, it is equal to the "nodata" value (-9999000.0) in case data availability of the underlying 1-h accumulations is

Gridded files of radar-derived 5 minute precipitation accumulations, corrected by rain gauge data. Radar data over the Netherlands and surrounding area measured by Dutch, Belgian, and German radars are corrected by available data from automatic and manual rain gauges. Time interval is 5 minutes.

Starting with data from 31 January 2023 - 10.45 UTC onwards, this dataset is created using improved algorithms. This includes correction for signal attenuation, correction for vertical variation of precipitation, correction for fast-moving showers and use of uncertainty information in merging data from multiple radars.

Starting with data from 18 November 2024 - 14.40 UTC onwards, this dataset is created using improved methodologies. This includes a) the usage of additional rain gauge data from water authorities and water companies, b) a two-step methodology to construct based on rain gauge data a large-scale and localised adjustment field for correcting precipitation estimates; and c) reducing the quality indication of data of the Herwijnen radar of the lowest two elevations and for a small set of azimuth angles, to mitigate beam blockage due to trees and wind turbines.

Nowcast precipitation forecast up to 2 hours ahead, per 5 minutes, over the Netherlands. The forecast contains 25 time steps: +0 minutes to +120 minutes. Forecasted is the precipitation sum per 5 minutes, on a grid of 1x1 km. To obtain a precipitation intensity in mm/hour, the values ​​must be multiplied by 12. The forecast is made with an operational KNMI implementation of pySTEPS (https://pysteps.github.io). The forecast is initiated with the KNMI 5-minute real-time precipitation accumulation product: RTCOR-5m.

Archive of volume data of all radar moments (e.g. radar reflectivity, radial velocity, polarimetric variables, quality indicators) for the radar in Den Helder. Time interval is 5 minutes. Data have been archived in one .tar file per day.

Gridded files of radar reflectivities at 1500 m over the Netherlands and surrounding area measured by two radars in Herwijnen and Den Helder. Time interval is 5 minutes. See data set radar_tar_refl_composites/1.0 for an archive that goes back to 2008.

Gridded files of radar-derived 24 hour precipitation accumulations, corrected by rain gauge data. Radar data from 1500 m over the Netherlands and surrounding area measured are corrected by data from KNMI's 325 manual rain gauges. Time interval is 1 day, from 8 to 8 UTC. KNMI has detected measurement anomalies caused by a defect in some rain gauges for manual precipitation observation. It concerns data from the second half of 2012 until present. At this moment KNMI is assessing the extent of the problem and investigates the options to repair the defect as soon as possible.

Climatological radar rainfall dataset of 5 minute precipitation depths at a 2.4-km grid, which have been adjusted employing validated and complete rain gauge data from both KNMI rain gauge networks. This dataset is updated once a month providing data up to a few months ago.

Ensemble nowcasts generated using pySTEPS based on 5-minute radar/gauge precipitation intensities. Ensemble nowcasts contain 20 members and are generated for 0-120 minutes lead time, with a time step of 5 minutes. NOTE: this is currently not an operational product, and hence there are no guarantees on its availability.

Archive of gridded files of probability of hail from radar over the Netherlands and surrounding area. Based on 14 radar scans by two radars in Herwijnen and Den Helder. Time interval is 5 minutes. Data have been archived in one .tar file per day.

Archive of gridded files of radar echo top heights over the Netherlands and surrounding area. Based on 15 radar scans by two radars in Herwijnen and Den Helder. Time interval is 5 minutes. Data have been archived in one .tar file per day.

Archive of volume data of radar reflectivity (uncorrected and corrected for ground clutter), radial velocity, and spread in radial velocity for the radar in De Bilt. Time interval is 5 minutes. Data have been archived in one .tar file per day.

Climatological radar rainfall dataset of 24 hour precipitation depths at a 1 km grid, which have been adjusted employing validated and complete rain gauge data from both KNMI rain gauge networks. This dataset is updated once a month providing data up to a few months ago.

Dataset containing hourly data files provided by Ruisdael Observatory's Metek Micro Rain Radar (SN 0512067699) placed at KNMI’s Remote Sensing Site in Cabauw. Time interval of measurements is 10 seconds and the range resolution is preferred to be set to 35 meters.

Archive of gridded files of radar-derived 3 hour precipitation accumulations, corrected by rain gauge data. Radar data from 1500 m over the Netherlands and surrounding area measured are corrected by data from the 32 KNMI automatic rain gauges. Time interval is 1 hour. Data have been archived in one .tar file per day.