Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 358 AM EDT Mon Mar 27 2017 Valid 12Z Mon Mar 27 2017 - 12Z Wed Mar 29 2017 ...There is a slight risk of severe thunderstorms over portions of the Tennessee/Southern Ohio Valleys... ...Rain/freezing rain possible over parts of the Northeast... ...Heavy snow for the Cascades and Central Rockies... ...Heavy rain for parts of the Southern Plains... A front extending from the Northeast to a wave of low pressure over the Middle/Lower Mississippi Valley then the boundary extending into the Southern Plains will move eastward to the Northeast/Northern Mid-Atlantic Coast trailing westward to the Southern Plains, while the wave of low pressure moves to the Mid-Atlantic by Tuesday evening. Showers and thunderstorms will develop along and ahead of the cold front over the Middle/Lower Mississippi Valley into parts of the Southern Plains that will move to the Mid-Atlantic/Southeast and westward across the Gulf Coast States by Tuesday evening. In addition, rain will develop over parts of the Northeast to the Central/Southern Appalachians that will move off most of the Northeast Coast overnight Monday. Also, rain/freezing rain and snow will develop over parts of the Northeast through late Monday night. Rain will return to the Northeast on Tuesday morning into Tuesday evening as the wave of low pressure moves into the Mid-Atlantic. Meanwhile, an upper-level trough over the West Coast will form an upper-level low over the Central/Southern Rockies on Tuesday into Tuesday evening. Rain and higher elevation snow will develop over the Pacific Northwest and Northern/Central California into parts of the Great Basin/Northern Rockies that will move into the Central/Southern Rockies and parts of the Northern/Central High Plains by Tuesday morning. As the system moves into the Southern High Plains, showers and thunderstorms will develop over parts of the Southern High Plains that will expand into parts of the Central/Southern Plains by Tuesday evening. Rain and higher elevation snow will continue over parts of the Northern/Central High Plains and the Central/Southern Rockies on Tuesday into Tuesday night. In the wake of the western storm, onshore flow will aid in producing rain and higher elevation snow over parts of the Pacific Northwest from overnight Monday into Tuesday evening. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php