National Severe Storms Laboratory National Severe Storms Laboratory (NSSL) National Severe Storms Laboratory NOAA’s National Sever Storm Laboratory two inches National Severe Storms Laboratory National Weather Service National Severe Storms Laboratory National Severe Storms Laboratory (NSSL) this isn’t snow 13 inches thunderstorms NOAA’s National Sever Storm Laboratory www.nssl.noaa.gov/education/svrwx101/winter/faq nearly two feet. this isn’t snow this isn’t snow National Severe Storm Laboratory