The Tennessee Emergency Management Agency and the National Weather Service are sharing an update about the incoming winter storm. | WSMV 4, Nashville

Meteorologists at Weather Prediction Center and the National Weather Service are working around the clock to forecast the upcoming major winter storm. Be prepared and visit weather.gov for the most up-to-date winter forecasts. | NOAA NWS Weather Prediction Center

NOAA's powerful Global Forecast System model was upgraded today, providing forecasters with a more accurate 4-D picture of how a weather system will evolve. The upgrade is the latest of a number of model improvements rolling out this spring and summer, thanks to increased supercomputing power NOAA acquired earlier this year. More information on the May 11, 2016 GFS upgrade here: http://www.noaa.gov/noaa’s-premier-forecast-model-goes-four-dimensional Video Credit: NOAA | U.S. National Weather Ser

NOAA'S RAP and HRRR models are now upgraded, providing improved severe weather & aviation forecasts. Learn more: weather.gov/news/200210-rapid-model | U.S. National Weather Service (NWS)