Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 252 PM EST Fri Jan 19 2024 Valid 00Z Sat Jan 20 2024 - 00Z Mon Jan 22 2024 ...Lake-effect snow downwind from the Great Lakes and upslope snow for the Central Appalachians into the Northeast; Higher elevation snow across the West... ...There is a Slight Risk of excessive rainfall over parts of Northern/Central California... ...Rain/Freezing Rain over parts of the Pacific Northwest and the Northern High Plains... High pressure over the Northern Plains will slowly move eastward to the Central Appalachians by Sunday evening. Cold air associated with the high will create temperatures 20 to 30 degrees below average from the Northern High Plains, the Plains, and Middle Mississippi Valley. Upper-level energy over the Great Lakes, Upper Midwest, and Northeast will produce lake-effect snow downwind from the Great Lakes. With a solid northerly component to the wind, the heaviest accumulations will be near the Manistee National Forest and the Michiana region of the Lower Peninsula of Michigan, as well as the Hiawatha National Forest in the Upper Peninsula of Michigan from Friday evening into Saturday evening. The snow will also be heaviest in the upslope portion of the Central Appalachians and over the Northeast. The lake-effect snows will slowly taper off from Saturday evening into Sunday evening. Multiple fronts will move onshore over the West and dissipate over the next few days. The systems will produce steady highest-elevation snow over the West, with the heaviest on Saturday evening into Sunday evening. In addition, a plume of moisture will move over parts of Northern California, producing heavy rain on Saturday and Sunday. Therefore, the WPC has issued a Slight Risk of excessive rainfall From Saturday into Sunday morning over parts of Northern California. The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, small streams, narrow canyons/gullies, and burn scars the most vulnerable. Moreover, the area of Slight Risk of excessive rainfall will move slightly farther south incorporating parts of Central California. Therefore, the WPC has issued a Slight Risk of excessive rainfall on Sunday over parts of Northern/Central California. The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, small streams, narrow canyons/gullies, and burn scars the most vulnerable. Furthermore, the warmer air associated with the plume of moisture will contribute to rain/freezing rain over parts of the Pacific Northwest in the region of the Columbia Gorge. From Saturday evening into Sunday evening, the heaviest rain/freezing rain will be over the Columbia Gorge, with lighter amounts over parts of the Northern Plains. Elsewhere, on Saturday, moisture from the Western Gulf of Mexico and upper-level energy will aid in producing rain over parts of southern Texas on Sunday. Ziegenfelder Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php