Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 240 AM EST Mon Dec 02 2024 Valid 12Z Mon Dec 02 2024 - 12Z Wed Dec 04 2024 ...Heavy lake-effect snow continues downwind from Lake Erie through Wednesday... ...Light snow over parts of the Middle Mississippi Valley, Southern Ohio Valley, and Southern Appalachians on Monday; moderate to heavy snow over parts of the Upper Peninsula of Michigan on Tuesday evening into Wednesday... ...Temperatures will be 10 to 15 degrees below average over parts of the Northern/Central Plains to the Ohio Valley and the Mid-Atlantic... High pressure over Central Canada/Northern Plains will settle southeastward to the Southeast by Wednesday. The high pressure will also usher cold air over parts of the Northern/Central Plains to the Ohio Valley and the Mid-Atlantic, bringing temperatures of 10 to 15 degrees below average. Additionally, Freeze Warnings will be over parts of the Southeast. The upper-level troughing will continue over parts of the Lower Great Lakes and Northeast through Tuesday afternoon. The continued cold air streaming over the Great Lakes will produce light to moderate lake-effect snow over the Upper Peninsula of Michigan and the west coast of the Lower Peninsula of Michigan through Monday. Moreover, heavy lake-effect snow will continue downwind from Lake Erie through Wednesday. Light to moderate lake-effect snow will continue downwind of Lake Ontario into Wednesday. Moreover, a wave of low pressure will create light snow over parts of the Middle Mississippi Valley, Southern Ohio Valley, and Southern Appalachians on Monday. On Tuesday evening, an approaching area of low pressure over Central Canada will create moderate to heavy snow over parts of the Upper Peninsula of Michigan into Wednesday. Meanwhile, weak return flow off the Gulf of Mexico will create scattered showers and thunderstorms over parts of the West Gulf Coast through Wednesday. Elsewhere, upper-level ridging will create stagnant air conditions over parts of the Pacific Northwest, leading to areas of dense fog and poor air quality. Furthermore, there is a High Wind Watch over parts of the Northern Rockies from Monday afternoon into Tuesday morning. Ziegenfelder Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php