Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 340 PM EDT Sat Mar 14 2020 Valid 00Z Sun Mar 15 2020 - 00Z Tue Mar 17 2020 ...Wet Sunday and Monday in store from the Southern Plains to Tennessee Valley... ...Multiple feet of snow forecast for the Sierra Nevada as the Northwest also receives heavy snow, heavy coastal rainfall likely in California... ...Frigid temperatures in the Northern Great Basin and Northern High Plains, warm temperatures along the Gulf Coast... A frontal boundary stretching from the Southern Plains to the Southeast will continue to stick around tonight and into Sunday. As a moist southwest flow intersects the front, areas of showers will form and lead to wet conditions over the Ohio Valley and Mid-South. Thunderstorms may also form from west Texas to the Tennessee Valley. There will be some light wintry precipitation with an inch or two of snow on average possible in the central Appalachians this evening. Showers will also track across the Mid-Atlantic tonight and early Sunday morning with drier conditions anticipated the second half of the day. The frontal boundary will push south Sunday and Monday making the Gulf Coast and Southern Plains the most favored areas to witness showers and thunderstorms some of which could be heavy. Some very localized flooding is possible in portions of Oklahoma on Monday. An upper-level low is forecast to drift southward very slowly along the West Coast Sunday and into the first half of next week, with stalled frontal systems at the surface across the northern Great Basin and northern Rockies. These features will lead to persistent precipitation in parts of the West. Periods of rain will be common along the California coast with snow or mixed precipitation in the Pacific Northwest. Rainfall amounts of 1 to 2 inches are forecast in the higher elevations of Southern California and northern suburbs of Los Angeles, which combined with recent heavy rainfall could lead to localized flash flooding on Monday. This has resulted in the issuance of a Marginal Risk for excessive rainfall in portions of Southern California on Monday. Higher elevations of California will see heavy snow, especially the Sierra Nevada where snow over the next two days alone will be measured in multiple feet. Elsewhere across the Intermountain West should also receive heavy snow in the higher elevations. Prolonged periods of snow in the Sawtooth, Tetons, and Wind River mountains through Sunday morning could create additional snow totals over 6 inches there. Later Sunday, light snows are forecast to move east from Montana into the north-central tier before tapering off on Monday thanks to high pressure building in across the region. North of the stalled frontal boundary in the Deep South will feature seasonally cooler temperatures on average both Sunday and Monday in the Central Plains, Mid and Upper Mississippi Valley, and extending into the Ohio Valley and Northeast. Parts of Montana will remains stuck in a cold temperature regime through Monday with daily temperature anomalies as cold as 30 degrees below normal. In contrast, the Gulf Coast will bask in above normal temperatures where daytime highs Sunday and Monday for some locations will hit 80 degrees. In fact, some parts of the Florida Panhandle will even make a run at 90 degrees on Sunday. Much of the Four Corners region and the central High Plains will experience warm temperature anomalies ranging between 10 to 15 degrees above normal on average through the first half of the week. Mullinax Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php