Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 242 PM EST Mon Dec 23 2024 Valid 00Z Tue Dec 24 2024 - 00Z Thu Dec 26 2024 ...Light to moderate snow over parts of the Northeast Monday night into Tuesday; Light to moderate snow over the Sierra Nevada Mountains Monday night into Tuesday... ...Light rain/freezing rain over parts of the Mid-Atlantic/Central Appalachians on Monday evening into Tuesday... ...Moderate to heavy rain over parts of Northern California... A wave of low pressure over the Great Lakes on Monday will move northeastward off the Northeast Coast by Tuesday evening. The system will produce light snow over parts of Michigan on Monday evening, ending by Tuesday morning. Overnight Monday into Tuesday, light to moderate snow will develop over parts of the Northeast/northern Mid-Atlantic. Along the rain/snow line, light rain/freezing rain areas will develop over parts of the Mid-Atlantic/Central Appalachians through early Tuesday morning into Tuesday evening. Moreover, light rain will develop from the Southern Plains to the Ohio Valley on Monday. The rain will continue over parts of the Middle Mississippi and Ohio Valleys through Wednesday. In addition, return flow off the Gulf of Mexico will stream moisture over the Southern Plains, producing showers and thunderstorms overnight Monday through Tuesday. Overnight Tuesday, the showers and thunderstorms will move into parts of the Lower Mississippi Valley and continue through Wednesday evening. Furthermore, low pressure will develop along the Southeast Coast and slowly move northeastward out over the Western Atlantic. The low will pull moisture off the Atlantic and stream the moisture northward over the southern Mid-Atlantic, producing light rain over the area through Tuesday night. Meanwhile, on Monday into Tuesday, a front over the Eastern Pacific will move onshore over the West Coast and continue to move into the Great Basin/Southern California by Tuesday and into the Southern High Plains by Wednesday afternoon. The system will bring moisture onshore, producing light rain over the Pacific Northwest and moderate to heavy rain over Northern California. As the front passes, rain will turn over to snow over parts of the higher elevations of the Northwest and Northern/Central California and light to moderate snow over the Sierra Nevada Mountains Monday night into Tuesday. The system will create lower-elevation rain and higher-elevation snow over parts of the Northern Intermountain Region and the Great Basin Tuesday evening into Wednesday. Light snow will move into parts of the Central/Southern Rockies by Wednesday afternoon. Moreover, another boundary over the Eastern Pacific will approach the Northwest Coast on Wednesday. Moisture associated with the storm will produce light rain and higher-elevation snow over parts of the Pacific Northwest. Ziegenfelder Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php