Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 423 AM EDT Thu Mar 20 2025 Valid 12Z Thu Mar 20 2025 - 12Z Sat Mar 22 2025 ...Major late winter/early spring snowstorm to push into the Upper Mississippi Valley and Great Lakes... ...Severe weather possible this evening across much of Illinois and Indiana... ...Light to moderate snow over the Cascades and Northern Intermountain Region; light snow over the Great Lakes, Central Appalachians, and Northeast... ...There is a Critical Risk of fire weather over the parts of the Southern High Plains and Florida on Thursday and an Elevated Risk over the Central/Southern Plains and Middle/Lower Mississippi Valley on Friday... A front extending from the Lower Great Lakes to the Eastern Gulf Coast will move off the East Coast by Friday evening. The system will produce light snow over the Great Lakes and rain over parts of the Lower Great Lakes/Ohio Valley to the Central Gulf Coast on Thursday morning. By Thursday afternoon into evening, showers and thunderstorms will develop over parts of the northern Mid-Atlantic to the southern Mid-Atlantic. Rain will also fall over parts of the Southeast. In addition, light snow will develop over parts of the Central Appalachians, ending by Friday morning. Further, light rain and snow will move into the Northeast overnight Thursday, with the last of the light snow and rain occurring by Friday evening. Meanwhile, on Thursday, a front over the Northern Intermountain Region to Southern California will move eastward to the Northern Plains to the Central High Plains overnight Thursday. On Thursday, the boundary will produce light snow over the Northern Intermountain Region and Northern Rockies. The front will be ushered by a third front moving out of Central Canada into the Northern Plains overnight Thursday. By Saturday, the two fronts will move eastward to the Lower Great Lakes and southward to the Lower Mississippi Valley/Southern Plains and Middle Mississippi Valley, respectively. By Friday evening, the systems will produce light snow over the Upper Great Lakes into the Upper Mississippi Valley. Showers and thunderstorms will also develop over parts of the Middle Missouri/Middle Mississippi Valleys on Friday. Moreover, light rain will move into the Ohio Valley and Lower Great Lakes overnight on Friday. Furthermore, on Thursday, upper-level energy and weak onshore flow will aid in producing coastal rain and higher-elevation snow over the Pacific Northwest and into parts of Northern California. Early Friday morning, a fourth front will move onshore over the Northwest, advancing to the Northern Rockies, and then extend roughly southwestward to southern Oregon. Coastal rain and higher-elevation snow will continue into Saturday over parts of the Pacific Northwest and Northern California. On Thursday, the SPC issued a Critical Risk of fire weather over parts of the Southern High Plains and Florida. On Friday the fire weather threat will lessen to an Elevated Risk over part of the Central/Southern Plains and Middle/Lower Mississippi Valley. Ziegenfelder Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php