Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 356 AM EST Tue Dec 06 2016 Valid 12Z Tue Dec 06 2016 - 12Z Thu Dec 08 2016 ...Severe thunderstorms possible for portions of the Southeast... ...Heavy snow possible for portions of the Northern Plains and Upper Mississippi Valley... ...Rain/Freezing rain possible over parts of the Central Appalachians... ...Temperatures will be 15 to 35 degrees below average over the Northern High Plains... Low pressure over the Tennessee Valley will move northeastward off the Mid-Atlantic Coast by Wednesday morning. The system will produce showers and thunderstorms over parts of the Southeast/Tennessee Valley that will move off the Southeast Coast by Tuesday evening. Rain will also develop over parts of the Lower Mississippi Valley/Tennessee Valley/Ohio Valley and parts of the Southern Mid-Atlantic that will lift northeastward into the parts of the Northern Mid-Atlantic/Lower Great Lakes by Tuesday evening and off most of the Northeast Coast by Wednesday afternoon. An area of rain/freezing rain will develop over parts of the Central Appalachians on Tuesday afternoon into evening. Snow will also develop over the higher elevations of the Northern Appalachians into Pennsylvania starting Tuesday evening that will wind down over parts of Northern New England by Wednesday afternoon into evening. Meanwhile, a second front extending from the Upper Great Lakes to the Middle/Lower Mississippi Valley into the Southern Plains and bank up against the Southern/Central Rockies will move eastward to the Northeast Coast across parts of the Southern Mid-Atlantic/Southeast and the Gulf Coast States by Wednesday evening. The storm will produce snow over parts of the Northern Plains to the Upper Great Lakes/Middle Mississippi Valley that will move into Manitoba/Ontario and Quebec by Wednesday afternoon. As the precipitation moves northeastward into Canada, areas of rain and snow will develop over portions of Michigan Tuesday evening into Wednesday morning. Snow will also linger over parts of the Northern Plains into the Upper Great Lakes overnight Tuesday into Wednesday evening. Additionally, upper-level energy over the Pacific Northwest will move southeastward to the Central Plains by Wednesday evening into Thursday. The energy will produce coastal rain and snow over the Pacific Northwest, even over the lower elevations of Washington State, through late Tuesday night. Rain and snow will develop over parts of Northern California ending by Tuesday evening. Snow will develop over parts of the Northern/Central Rockies and Great Basin moving into the Central Plains overnight Tuesday into Wednesday. The snow will end over the Northern Rockies/Great Basin by Wednesday morning, west to east. In addition, rain will develop over parts of the Southern Plains by Wednesday evening. Another system will be approaching the West Coast Wednesday into Thursday. Onshore flow will return to California on Wednesday afternoon into evening producing rain and higher elevations over parts of Northern/Central California by Wednesday evening. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php