Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 250 PM EST Mon Jan 01 2024 Valid 00Z Tue Jan 02 2024 - 00Z Thu Jan 04 2024 ...Moderate to heavy snow over the Sierra Nevada Mountains on Tuesday evening into Wednesday... ...Rain and higher elevation snow for the Pacific Northwest... ...Lake-enhanced and lake-effect snow downwind from the Great Lakes... A weak upper-level low over Northwestern Mexico will move eastward to the Tennessee Valley/Central Gulf Coast by Wednesday evening. The circulation around the upper-level low will draw moisture from the Gulf of Mexico starting early on Tuesday. The system will produce rain with embedded thunderstorms on Tuesday. Low pressure will develop along the Western/Central Gulf Coast on Wednesday. The rain and embedded thunderstorms will move into the Lower Mississippi Valley on Wednesday and into the Eastern Gulf Coast/Southeast by Wednesday evening. Meanwhile, a front over the Eastern Pacific moves onshore overnight Tuesday and to the Southwest by Wednesday evening. On Tuesday, the system will produce rain and higher-elevation snow over parts of the Pacific Northwest and Northern California. Overnight Tuesday into Wednesday, the rain will move into Southern California and moderate to locally heavy snow will develop over the Sierra Nevada Mountains. On Wednesday, light snow will develop over parts of the Great Basin. Moreover, a front over Western Canada will move into the Northern Tier States on Tuesday afternoon, moving into the Great Lakes/Ohio Valley on Wednesday. On Tuesday, upper-level energy ahead of the front will produce light lake-effect snow over parts of the Upper Great Lakes. On Wednesday, the lake-effect/lake-enhanced snow expands into the Great Lakes and the Lower Great Lakes by Wednesday evening. Likewise, upslope snow will develop over parts of the Central Appalachians on Wednesday. Elsewhere, upper-level energy moving over the Appalachians/Mid-Atlantic will trigger light rain and higher-elevation snow on Monday evening. Ziegenfelder Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php