National Weather Service: www.weather.gov

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National Oceanic and Atmospheric Administration: www.noaa.gov

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NOAA/NWS Storm Prediction Center: www.spc.noaa.gov

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NOAA National Severe Storms Laboratory: www.nssl.noaa.gov

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Comet-Meted Education and Training: www.meted.ucar.edu/education_training/courses

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Community Collaborative Rain, Hail & Snow Network (CoCoRaHS): www.cocorahs.org