Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 256 AM EST Wed Jan 31 2024 Valid 12Z Wed Jan 31 2024 - 12Z Fri Feb 02 2024 ...Heavy snow over parts of the Sierra Nevada Mountains, moderate snow over Upstate New York/Northern New England, light snow over the higher elevations of the West... ...There is a Slight Risk of excessive rainfall over parts of Northern/ Central California on Wednesday and Southern California on Thursday... ...Temperatures will be 15 to 30 degrees above average from the Plains to the Upper/Middle Mississippi Valley... A front moving onshore over the West Coast will move inland to the Rockies by Friday morning. A plume of moisture will move along the West Coast and then transition into Southern California overnight Wednesday. On Wednesday, the robust plume of moisture will move over California, creating heavy rain over California. Therefore, the WPC has issued a Slight Risk of excessive rainfall over parts of Northern/Central California and extending a small part of Southern California through Thursday morning. The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, small streams, and burn scars the most vulnerable. Furthermore, the moisture will also create snow over parts of Northern/Central California. The Shasta and Sierra Nevada mountains will get heavy snow from late Wednesday morning into Thursday morning. On Thursday, the moisture plume will aim at Southern California, producing heavy rain. Therefore, the WPC has issued a Slight Risk of excessive rainfall over parts of Southern California from Thursday into Friday morning. The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, small streams, and burn scars the most vulnerable. Moreover, the heavy snow will continue over the Sierra Nevada Mountains on Thursday. In addition, as the moisture moves inland over most of the West, rain will develop at the lower elevations and snow over the highest elevations across most of the West. Meanwhile, a sharp upper-level ridge will develop over the Northern Plains into the Middle Mississippi Valley. Due to the ridge, temperatures will be 15 to 30 degrees above average from the Plains to the Upper/Middle Mississippi Valley. Further, overnight Wednesday, a front moving out of East-Central Canada will move into the Great Lakes and Northeast on Thursday. The system will aid in creating light snow over parts of New York State and Northern New England on Thursday. Elsewhere, low pressure over the Southern Appalachians will redevelop over the Western Atlantic by Wednesday evening and continue to move eastward over the ocean. The system will produce light snow over the higher elevations of the Central Appalachians and light rain over the Southern Appalachians and the southern Mid-Atlantic. All the precipitation will end by Wednesday evening. Ziegenfelder Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php