Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 301 AM EST Mon Dec 05 2016 Valid 12Z Mon Dec 05 2016 - 12Z Wed Dec 07 2016 ...There is a slight risk of severe thunderstorms over parts of the Central Gulf Coast and Southeast... ...Heavy rain possible over parts of the Central Gulf Coast/Lower Mississippi Valley to the Southeast... ...Heavy snow possible over parts of the Northern Plains/Upper Mississippi Valley... ...Snow possible over the Cascades and Central Rockies... A front extending from the Northern Plains to the Great Basin will move east and southward to Great Lakes/Ohio Valley to the Central Gulf Coast and banked up against the Southern Rockies by Tuesday evening. The system will produce snow over parts of the Northern/Central Rockies/Great Basin to the Northern Plains ending over the Northern High Plain/Central Rockies overnight Monday. The snow will move into parts of the Upper/Middle Mississippi Valley by Monday evening into Tuesday evening. The snow will be heavy over parts of the Northern Plains/Upper Mississippi Valley. Behind the system, onshore flow off the Pacific will aid in producing rain and higher elevation snow through Tuesday morning. The snow levels will lower substantially by Monday, with a mix of rain and snow possible even at the lower elevations around Puget Sound. Additional upper-level energy will move over the Northwest Coast overnight Monday aiding in the development of rain and higher elevation snow over parts of the Pacific Northwest into Northern California by Tuesday morning with snow expanding into parts of the Northern/Central Rockies and Great Basin by Tuesday evening. Meanwhile, another front over the Gulf Coast will lift northward into the Tennessee Valley/Southeast by Tuesday morning and move off the Southeast Coast by Tuesday evening. Moisture from the Gulf of Mexico will overrun the boundary and pool along the front aiding in the development of showers and thunderstorms over the Western Gulf Coast to parts of the Southeast that will end over the Western Gulf Coast by Tuesday morning. The showers and thunderstorms will be confined to the Florida peninsula by Tuesday evening. Rain will also develop over parts of the Southern Plains into parts of the Carolinas that will likewise end over the Southern Plains by Tuesday morning. The rain will lift into parts of the Middle Mississippi Valley eastward into the Southern Mid-Atlantic overnight Monday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php