Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 313 AM EDT Mon Oct 28 2024 Valid 12Z Mon Oct 28 2024 - 12Z Wed Oct 30 2024 ...Moderate to heavy snow over parts of the Northern/Central Rockies on Tuesday... ...Temperatures will be 20 to 30 degrees above average over parts of the Plains and Mississippi Valley... ...There is a Marginal Risk of severe thunderstorms over parts of the Upper/Middle Mississippi Valley and Central/Southern Plains on Tuesday... A front extending from the Northern Plains to the Great Basin and Southern California will move eastward to the Upper Mississippi Valley/Upper Great Lakes southwestward to the Southern High Plains by Wednesday. Ahead of the front, temperatures will be 20 to 30 degrees above average over parts of the Plains and Mississippi Valley. In the wake of the front, onshore flow off the Pacific will produce rain over the Pacific Northwest and Northern California through Tuesday night. In addition, scattered light snow will develop over the highest elevations of the Cascades, the Sierra Nevada Mountains, the Northern Intermountain Region, and the Great Basin through Wednesday. Lower-elevation rain will also develop over parts of the Great Basin, Southwest, and Northern/Central Rockies. Further, intensifying upper-level energy over the Four Corners Region will aid in producing moderate to heavy snow over parts of the Northern/Central Rockies and higher elevations of the eastern Great Basin on Tuesday. Meanwhile, southeasterly flow off the Gulf of Mexico will create scattered rain over parts of the Western Gulf Coast on Monday. On Tuesday, the atmosphere along the Western Gulf Coast will become more unstable, so showers and thunderstorms will develop over parts of the Western Gulf Coast. Similarly, easterly flow off the Atlantic will produce rain over parts of Florida on Monday. On Tuesday, the atmosphere will become more unstable, so showers and thunderstorms will develop over parts of Florida. Moreover, moist air will pool ahead of the front over the Great Lakes on Monday, creating showers and thunderstorms. Rain will develop over parts of the Northeast on Tuesday into Wednesday morning and also over parts of the Northern/Central Plains and Upper Mississippi Valley on Tuesday. Additionally, moisture will pool along the boundary over parts of the Upper/Middle Mississippi Valley to Central/Southern Plains, producing strong to severe thunderstorms. Therefore, the SPC has issued a Marginal Risk (level 1/5) of severe thunderstorms over parts of the Upper/Middle Mississippi Valley to Central/Southern Plains from Tuesday into Wednesday morning. The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a minimal threat of tornadoes. Ziegenfelder Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php