Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 356 AM EDT Tue Mar 28 2017 Valid 12Z Tue Mar 28 2017 - 12Z Thu Mar 30 2017 ...There is a slight risk of severe thunderstorms over Southern Plains... ...Heavy snow possible over the Cascades and the Central Rockies... ...Heavy rain possible over parts of the Pacific Northwest and the Central/Southern Plains/Lower Mississippi Valley... Low pressure over Eastern Ohio Valley/Central Appalachians will move off the Mid-Atlantic Coast overnight Tuesday. Showers and thunderstorms will develop along and ahead of the associated cold front from the Central Appalachians/Tennessee Valley to the Mid-Atlantic/Southeast on Tuesday morning that will move off the Mid-Atlantic/Southeast Coast Tuesday evening into Wednesday morning. Rain will also develop over the Lower Great Lakes into parts of the Northeast that will move off the Northeast Coast by Wednesday afternoon. Also, snow will develop over parts of Northern Maine with a few pockets of rain/freezing rain through Wednesday morning. Snow will return to parts of western Northern New England by Wednesday afternoon into evening. Meanwhile, an upper-level low over the Southwest will slowly advance eastward to Southern/Central Plains by Wednesday evening. Rain and higher elevation snow will develop over parts of the Central/Southern Rockies and Northern/Central High Plains that will end by Wednesday evening. Showers and thunderstorms will begin to develop over parts of the High Southern Plains that will expand into parts of the Central/Southern Plains by Tuesday evening. Overnight Tuesday the showers and thunderstorm will move into parts of the Middle/Lower Mississippi Valley that will be ending over most of the Southern Plains by Wednesday evening. Additionally, rain will develop over parts of the Central Plains on Tuesday morning that will move into parts of the Middle Missouri Valley on Wednesday. In the meantime, onshore flow along with multiple upper-level disturbances will aid in producing rain and higher elevation snow over parts of the Pacific Northwest Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php