Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 215 AM EST Sat Jan 27 2024 Valid 12Z Sat Jan 27 2024 - 12Z Mon Jan 29 2024 ...Heavy snow and rain/freezing rain over parts of Northern New England and snow over parts of the Appalachians on Sunday... ...There is a Slight Risk of excessive rainfall over parts of the Central/Southern Appalachians and Mid-Atlantic on Saturday... ...There is a Slight Risk of severe thunderstorms over parts of the Southeast on Saturday... A wave of low pressure over the Lower Mississippi Valley moves northeastward to the Mid-Atlantic by Sunday, then out over the Western Atlantic by Monday. Moisture will surge northward over the Southeast into the Mid-Atlantic, producing heavy rain. Therefore, the WPC has issued a Slight Risk of excessive rainfall over parts of the Central/Southern Appalachians and Mid-Atlantic through Sunday morning. The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, and small streams the most vulnerable. Moreover, light snow will fall over parts of the Lower Great Lakes along the northern edge of the precipitation shield. Additionally, showers and severe thunderstorms will develop over parts of the Southeast. Therefore, the SPC has issued a Slight Risk of severe thunderstorms over parts of the Southeast through Sunday morning. The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, few tornadoes, and a minimal threat of hail. On Sunday, rain will continue over the Ohio Valley to the Mid-Atlantic and showers and thunderstorms will develop over parts of Coastal Mid-Atlantic into Florida. However, the threat of severe thunderstorms and excessive rainfall will end on Sunday. Also, as the precipitation shield moves into colder air on Sunday, snow will develop from parts of the Ohio Valley/Lower Great Lakes to New England. Heavy snow will develop over parts of Northern New England, while pockets of rain/freezing rain will develop from parts of eastern New York State into Southern New England. Snow will also develop over parts of the Central/Southern Appalachians. By Monday morning, the area of low pressure will be over the Western Atlantic. Meanwhile, moisture will stream into the Pacific Northwest and Northern California, mainly producing rain and highest-elevation snow in a few places. The rain will continue over the Pacific Northwest through early Sunday afternoon. The rain will be over by Monday morning. Ziegenfelder Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php