Abstract

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


Metadata

Dataset name radar_forecast
Dataset version 1.0
Status onGoing
Last metadata update July 23, 2025, 11:32 (UTC)
Update frequency continual
Spatial representation type grid
License https://creativecommons.org/licenses/by/4.0/
North bound latitude 55.97
East bound longitude 10.86
South bound latitude 48.9
West bound longitude 0.0
Dataset edition 2
Dataset manager Hidde Leijnse
Maintainer KNMI Data Services
Publication timestamp 2014-12-01T16:01:32Z
Reference system identifier PROJ.4+proj=stere +lat_0=90 +lon_0=0 +lat_ts=60 +a=6378.14 +b=6356.75 +x_0=0 y_0=0
Dataset start time 2008-01-01
Dataset end time 9999-12-31
Identifier urn:xkdc:ds:nl.knmi::radar_forecast/1.0/
Lineage statement Radar reflectivities are measured by both radars (Herwijnen at 51,8369 N, 5,1381 E and Den Helder at 52.9533 N, 4.7900 E) in scans with elevation angles of 0.3, 1.1, 2.0, and 3.0 degrees. These scans are used to generate a single image per radar at 1500 m by linearly interpolating radar reflectivities in altitude. These two radar images are then combined to a single image by taking a weighted average of the radar reflectivities. The weigths are a function of the distance of a given point to the radar. Radar reflectivity fields are forecast by extrapolating the current radar field using advection velocitite derived from previous radar reflectivity fields.
Use limitation No use limitations
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