Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 419 AM EDT Sun Mar 26 2017 Valid 12Z Sun Mar 26 2017 - 12Z Tue Mar 28 2017 ...There is a slight risk of severe thunderstorms over portions of the Southern Plains... ...Heavy rain possible over parts of the Tennessee Valley... ...Rain/freezing rain possible over parts of the Upper Great Lakes and the Northeast... An upper-level low over Middle Mississippi Valley/Western Ohio Valley will slowly weaken while moving northeastward to Maine by Monday evening. Showers and thunderstorms will develop along the Central Gulf Coast on Sunday morning that will expand northward into parts of the Ohio Valley by Sunday afternoon into Sunday evening. Showers and thunderstorms will be restricted to the Southern Appalachians by Monday morning, expanding into parts of the Central/Southern Appalachians by Monday evening. Rain will also develop over parts of the Upper/Middle Mississippi Valley and the Great Lakes/Ohio Valley as well as parts of the Northern Mid-Atlantic on Sunday morning that will move into parts of the Northeast by Sunday evening into Monday morning. The rain will wane over parts of the Western Ohio Valley/Upper Mississippi Valley overnight Sunday. In addition, rain/freezing rain will develop over parts of the Upper Great Lakes on Sunday morning and over parts of the Northeast on Sunday night into Monday morning. Snow will also develop over parts of Maine overnight Sunday into Monday and Monday evening. Meanwhile, energy over the Southern/Central Rockies and High Plains will move northeastward to the Ohio Valley by Monday evening. The system will produce rain and higher elevation snow over parts of the Central Rockies on Sunday ending overnight Sunday. On Sunday afternoon into evening, showers and thunderstorms will develop over parts of the Central/Southern Plains that will move into parts of the Middle/Lower Mississippi Valley by Monday morning. The showers and thunderstorms will move into parts of the Ohio Valley/Tennessee Valley and parts of the Southeast by Monday evening. Over the West Coast, a front will move onshore by Sunday evening continuing to move eastward to the Rockies by Monday evening. The storm will begin to produce rain and higher elevation snow over parts of the Pacific Northwest/Northern California that will expand inland to parts of the Northern Rockies by Sunday evening. The rain and higher elevation snow will move into parts of the Great Basin on Monday and into parts of the Central Rockies/Southwest on Monday afternoon into Monday evening. Behind the system, onshore flow will aid in producing coastal rain and higher elevation snow over parts of the Pacific Northwest/Northern California on Monday into Monday evening. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php