Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 246 PM EST Fri Feb 16 2024 Valid 00Z Sat Feb 17 2024 - 00Z Mon Feb 19 2024 ...Heavy snow over parts of the Central Appalachians/northern Mid-Atlantic... ...Lake-effect snow over parts of the Great Lakes and snow over the Pacific Northwest to the Central Rockies and Sierra Nevada Mountains... ...There is a Slight Risk of excessive rainfall over parts of California from Saturday into Sunday... A wave of low pressure over the Ohio Valley will move northeastward off the Mid-Atlantic Coast by Saturday morning. The system will create snow over the Middle Mississippi Valley/Ohio Valley and heavy snow over parts of the Central Appalachians and northern Mid-Atlantic from Friday evening into Saturday morning. The snow will result in reduced visibility and hazardous driving conditions. The snow will linger over parts of the Central Appalachians/northern Mid-Atlantic through Saturday evening. Moreover, showers and thunderstorms will develop over parts of the Southern Ohio/Tennessee/Lower Mississippi Valleys, ending on Saturday. The showers and thunderstorms will move into parts of the Southeast overnight, Friday through Sunday. Furthermore, upper-level energy moving over the Great Lakes into the Northeast will produce lake-effect snow downwind from the Great Lakes, with the heaviest amounts over the eastern UP of Michigan and northwestern LP of Michigan. Other areas of heavier snow will be downwind from Lakes Erie and Ontario. The snow will continue through Sunday. The snow will result in reduced visibility and hazardous driving conditions. Additionally, upper-level energy over the Northern Rockies will aid in creating snow over parts of the Great Basin and the Central Rockies through early Saturday morning. On Saturday morning, snow will develop over parts of the Central/Southern High Plains, ending by Saturday evening. The snow will result in reduced visibility and hazardous driving conditions. Meanwhile, a front off-shore from the West Coast will move onshore and dissipate by Saturday evening. Upper-level energy associated with the dying front moves over the Pacific Northwest, producing rain and higher-elevation snow from early Saturday morning through Sunday. Snow will also develop overnight Saturday into Sunday over parts of the Northern Intermountain Region. In addition, on Saturday, rain and higher-elevation snow will develop over parts of Northern/Central California. Further, a plume of moisture will stream into California on Saturday, producing areas of heavy rain. Therefore, the WPC has issued a Slight Risk of excessive rainfall over parts of Northern California from Saturday into Sunday 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. On Sunday, the plume of moisture will move over Southern California, producing heavy rain from Northern California to Southern California. Therefore, the WPC has issued a Slight Risk of excessive rainfall over parts of Northern California to Southern California on Sunday. The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, small streams, and burn scars the most vulnerable. Ziegenfelder Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php