Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 319 PM EST Tue Mar 07 2017 Valid 00Z Wed Mar 08 2017 - 00Z Fri Mar 10 2017 ...There is a slight risk of severe thunderstorms over parts of the Lower Mississippi Valley... ...Heavy snow possible over the Northern Cascades... ...Heavy snow possible over parts of Bitterroots, Sawtooth, and Wind River Mountains ...Heavy rain possible over parts of the Pacific Northwest... A front extending from the Lower Great Lakes/Central Appalachians to the Lower Mississippi Valley will move eastward off the East Coast by Wednesday afternoon. Showers and thunderstorms will develop a long and ahead of the boundary from the Southern Appalachians to the Lower Mississippi Valley/Western Gulf Coast that will retreat to the Central/Western Gulf Coast by Wednesday morning. The showers and thunderstorms will generally end by Wednesday evening. In addition, rain will develop a long the front from the Lower Great Lakes/Ohio Valley to the Central Appalachians/Tennessee Valley that will move off the Eastern Sea Board by Wednesday afternoon. Showers and thunderstorms will develop over Florida on Wednesday afternoon that will linger a long the Southeast Florida Coast by Thursday morning. Rain will also develop over the Northeast with areas of rain/freezing rain over parts of Northern New England overnight Tuesday into Wednesday morning. The rain will end by Wednesday evening. In the wake of the storm, light snow will develop over parts of the Upper Mississippi Valley that will move into the Upper Great Lakes by Wednesday and by overnight Wednesday the snow will expand into parts of the Northeast. Meanwhile, a front will move onshore over the Pacific Northwest on Tuesday afternoon that will move to the Northern High Plains by Wednesday morning becoming an east/west boundary across the Northwest into the Northern High Plains. An associated plume of moisture will stream into the Northwest and parts of Northern California through Thursday morning. The storm will produce rain and higher elevation snow over parts of the Pacific Northwest/Northern California through Thursday. Snow and lower elevation rain will develop over parts of the Northern Intermountain Region/Northern Rockies into the Northern High Plains through Thursday, too. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php