Ambient Weather - http://www.ambientweather.com
Citizens Weather Observer Program (CWOP) - http://www.wxqa.com
CoCoRaHS - http://www.cocorahs.org
NWS Cooperative Observer Program - http://www.nws.noaa.gov/om/coop/
MESOWEST Data - http://www.met.utah.edu/jhorel/html/mesonet/
Meteorological Assimilation Data Ingest System (MADIS) - http://www-frd.fsl.noaa.gov/mesonet/
Texas Mesonet (Texas A&M) - http://mesonet.tamu.edu/
Tennessee Hydrometeorological Networks - http://www.eol.ucar.edu/projects/hydrometnet/tennessee/
Weather Underground Personal Weather Stations - http://www.wunderground.com/weatherstation/
WeatherForYou.com - http://www.weatherforyou.com/
Davis Instruments - http://www.davisnet.com/
La Crosse - http://www.lacrossetechnology.com/
Oregon Scientific - http://www2.oregonscientific.com/
Rainwise - http://www.rainwise.com/
Texas Weather Instruments - http://www.txwx.com/
Mid-South Area Weather Web Sites