Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 342 PM EDT Sun Oct 13 2024 Valid 00Z Mon Oct 14 2024 - 00Z Wed Oct 16 2024 ...Wet snow over parts of the Upper Midwest to the Northeast and Central Appalachians... ...There is a Marginal Risk of excessive rainfall over parts of the southeastern Florida Peninsula on Sunday... ...There is a Marginal Risk of severe thunderstorms over parts of the Central Appalachians on Sunday... A front extending from the Northeast southwestward to the Southern Plains moves eastward to off most of the Eastern Seaboard by Tuesday evening. High pressure over Central Canada will move southward to the Central Plains/Middle Mississippi Valley by Monday. The clear sky and calm wind associated with the high have triggered Freeze Warnings, Advisories, and Watches over parts of the Northern and Central Plains. Upper-level energy associated with the boundary will produce rain from the Northeast to the Upper Mississippi Valley through Tuesday evening. Wet snow will develop over parts of the Upper Mississippi Valley through late Monday night and the higher elevations of the Northeast through Tuesday evening. In addition, wet snow will develop over parts of the Huron Mountains of Michigan s Upper Peninsula early Tuesday morning into Tuesday evening. On Tuesday afternoon, wet snow will develop over parts of the highest elevations of the Central Appalachians. Further, lake effect rain will develop downwind of the Great Lakes from Monday afternoon through Tuesday evening over parts of the Ohio Valley and Central Appalachians. Moreover, as the front moves over the Central Appalachians on Sunday afternoon, the boundary will produce showers and moderate to severe thunderstorms over parts of the Central Appalachians. Therefore, the SPC has issued a Marginal Risk (level 1/5) of severe thunderstorms over parts of the Central Appalachians through Monday morning. The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a minimal threat of tornadoes. Meanwhile, easterly flow off the Atlantic will aid in producing showers and thunderstorms with moderate to heavy rain over parts of southeastern Florida. Therefore, the WPC has issued a Marginal Risk (level 1/4) of excessive rainfall over parts of southeastern Florida through Monday morning. The associated heavy rain will create localized areas of flash flooding, affecting areas that experience rapid runoff with heavy rain. Furthermore, a front moving onshore over the Pacific Northwest late Monday morning will move inland to the Northern Intermountain Region and Northern California by Tuesday evening. The system will produce light rain over parts of the Pacific Northwest through late Tuesday afternoon. In addition, upper-level dynamics associated with an upper-level low over the Great. From Sunday evening through Tuesday evening, scattered showers and thunderstorms will cover parts of the Great Basin and Central Rockies. Ziegenfelder Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php