Citizen Weather Observer Program
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The Citizen Weather Observer Program (CWOP) is a network of privately owned electronic weather stations in the United States. 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 United States' lower 48 states. Observations are also re-distributed 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, 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.
The Meteorological Assimilation Data Ingest System (MADIS) integrates weather observations from numerous different sources, including CWOP via FindU, and drives a number of different weather forecasting products. Incoming data are subjected to temporal and spatial consistency checks, and quality flags are stored with the data, to enable users to access the most trustworthy data possible. From MADIS, CWOP data is also re-distributed to other users such as Mesowest.
Ease of sending data
The amateur radio connection makes it inexpensive and simple for an individual to install consumer-level weather sensors at a point of interest, connect them to a radio transmitter via a simple APRS modem, and start sharing weather reports with forecasters worldwide. Solar power and radio transmission makes it possible to drop completely self-contained weather sensors on unattended and un-wired sites, allowing for a dense set of sample measurements to be collected.
Other weather networks
Another weather data aggregation network is the Weather Underground personal weather station network. Many personal stations submit data to both systems; however, separate alphanumeric designators are assigned to the same weather station by each network.
- Citizens Weather Observing Program. Hourly Number of WX Stations sending data to CWOP servers. Retrieved on 2012-12-09.
- David Helms. Citizen Weather Observer Program (CWOP) Information. Retrieved on 2008-01-12.
- Citizen Weather Observer Program
- APRS links and information, after Bob Bruninga, WB4APR
- APRSWXNET Information page about APRS weather reporting by Steve Dimse
- CWOP quality control description by Russ Chadwick
- CWOP wiki by Russ Chadwick
- Sample FindU weather report, from KG6PPD-9 on Tamarack Mountain, near Bear Valley, CA, or KG6PPD-9 website.
- WEDAAL (WetterDAtenAusLese) - similar program to CWOP in Germany collecting weather data
- CWOP on NOSA