Prognostic Meteorological Discussion
Issued by NWS
Issued by NWS
631 FXUS01 KWBC 171930 PMDSPD Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 229 PM EST Mon Nov 17 2025 Valid 00Z Tue Nov 18 2025 - 00Z Thu Nov 20 2025 ...Heavy snow over the Sierra Nevada Mountains on Monday... ...Lake effect snow downwind from Lakes Erie and Ontario on Monday... ...Upslope snow over the Northeast on Monday... Rain is expected to spread across the West Coast as a developing upper-level low moves southward. There is potential for embedded thunderstorms for portions of central California through Tuesday morning and for heavy snow over the Sierra Nevada Mountains, through tonight. Rain and higher-elevation light snow are expected to generate over parts of the Pacific Northwest on Tuesday morning, tapering off by Wednesday. Showers and thunderstorms, along with high-elevation snow, will begin to develop over parts of the Southwest late tonight and is expected to continue through Wednesday morning. An area of low pressure located over the Central Rockies will move advance through the plains toward the southern Ohio Valley by Tuesday night into Wednesday. It will generate higher-elevation snow and lower-elevation rain over parts of the Great Basin/Central Rockies through late tonight. Scattered showers and thunderstorms will develop over parts of the Northern/Central Plains, expanding into the Middle/Lower Mississippi Valley by this evening. By Tuesday morning, light snow will develop along the northern edge of the precipitation shield over parts of the Upper Mississippi Valley/Great Lakes into parts of the Ohio Valley. Rain and a few embedded thunderstorms will develop over parts of the Ohio Valley on Tuesday, tapering off by Wednesday. In addition, rain will move into the Central Appalachians and Mid-Atlantic on Tuesday afternoon, continuing into Wednesday. Ongoing lake-effect snow downwind of Lakes Erie and Ontario will taper off tonight while snow over parts of northeastern New York State and the Northeastern Mountains will wane by Tuesday night.For Florida, onshore flow will aid in scattered showers through Wednesday. Campbell Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php $$