Citizen Weather Observer Program (CWOP)

The Citizen Weather Observer Program (CWOP) is a public-private partnership with three goals:

1) to collect weather data contributed by citizens;

2) to make these data available for weather services and homeland security; and

3) to provide feedback to the data contributors so they have the tools to check and improve their data quality. In fact, the web address,, stands for weather quality assurance.

The number of North American CWOP stations sending data over the past several days is normally more than 7000 stations sending 50,000 to 75,000 observations every hour. The number of world-wide citizaen weather stations sending data to CWOP is shown increasing over the past decade.

CWOP members send their weather data by internet alone or internet-wireless combination to the findU server and then every five minutes, the data are sent from the findU server to the NOAA MADIS server. The data undergo quality checking and then are distributed to users. There are over 800 different organizations using CWOP mesonet data. Here is a partial list:a


NWS Weather Forecast Offices
National Center for Environmental Prediction
National Ocean Service
National Transportation Safety Board
National Center for Atmospheric Research
Department of Homeland Security
Denver Urban Drainage and Flood Control District
Colorado Avalanche Information Center
Kennedy Space Center
NASA Marshall Space Flight Center
University Corporation for Atmospheric Research
Embry-Riddle Aeronautical University
MIT Lincoln Laboratories
University of Utah
Penn State University
Mississippi State University
University of Alaska
University of North Dakota
Hampton University
Texas A&M University
University of Hawaii
Florida State University
Weather Underground


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