Citizen Weather Observer Program

The Citizen Weather Observer Program (CWOP) is a network of privately owned electronic weather stations concentrated in the United States but also located in over 150 countries. Network participation allows volunteers with computerized weather stations to send automated surface weather observations to the National Weather Service (NWS) by way of the Meteorological Assimilation Data Ingest System (MADIS). This data is then used by the Rapid Refresh (RAP) forecast model to produce short term forecasts (3 to 12 hours into the future) of conditions across the contiguous United States. Observations are also redistributed to the public.

The CWOP was originally set up by amateur radio operators experimenting with packet radio, but now includes a majority of Internet-only connected stations. As of December 2012^[update], more than 8,000 stations worldwide report regularly to the network.

The Citizen Weather Observer Program is a program to collect surface weather observations from thousands of privately operated weather stations, into the FindU database, and forward it to the Meteorological Assimilation Data Ingest System (MADIS), operated by the National Oceanic and Atmospheric Administration (NOAA).

The FindU database is a set of privately operated Internet servers, run by Steve Dimse, (amateur radio callsign K4HG). Numerous IGates (Internet Gateways) receive broadcast amateur radio Automatic Packet Reporting System (APRS) packets containing position and short messages (including telemetry such weather observations), and forward the data to the FindU servers via APRS-IS on the Internet. Weather observations may be polled directly from FindU, and the data is forwarded to MADIS for ingest. APRS messages may also originate directly from computers on the Internet without being broadcast on the radio waves.

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