Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 PM EDT Sun Apr 12 2020 Valid 00Z Mon Apr 13 2020 - 00Z Wed Apr 15 2020 ...Severe weather and flash flooding expected to be widespread across the Southeast and Tennessee Valley through tonight... ...Severe weather a threat for the Eastern Seaboard Monday... ...Significant cold and snowfall forecast for the Upper Midwest to Upper Great Lakes through Monday... A potent storm system will continue moving northeastward through Monday, causing a variety of weather hazards. On the southern side, widespread thunderstorms are likely, and the atmospheric conditions are expected to be favorable for severe weather for the Lower Mississippi Valley, Tennessee Valley, and Southeast through tonight. Tornadoes, hail, and high winds are all potential severe threats. As rain amounts could exceed 2 inches in some locations, and there is the potential for training (storms repeating over the same location), flash flooding is another hazard today and tonight just north of the highest severe weather threat, in the Tennessee Valley toward the Southern Appalachians. Moderate Risks of both severe weather and flash flooding are in place through tonight. As the cold fronts sweep eastward toward the Eastern Seaboard, severe weather is once again a threat on Monday especially ahead of the initial cold front--an Enhanced Risk of severe weather has been outlooked for portions of the Southeast to Mid-Atlantic. There could be isolated incidents of flash flooding in the Mid-Atlantic to Northeast, but rain and storms should be fast-moving, so the flooding threat should not be as widespread on Monday. To the north and west of the track of the surface lows, cold temperatures will support snow continuing across portions of the Upper Midwest to Great Lakes region through Monday, and Winter Storm Warnings and Winter Weather Advisories are in effect. Snow amounts should peak over the Upper Peninsula of Michigan, where over a foot of snow is forecast. Winds are expected to increase as well, not only to the west of the low (resulting in blowing snow and cold wind chills), but also to the east of the cold front with strong southerly flow. Widespread Wind Advisories and High Wind Watches/Warnings are in place across the eastern half of the U.S. The strong cold fronts associated with this storm system will cause large temperature drops across the Mississippi, Ohio, and Tennessee Valleys on Monday. Record cold temperatures are possible from the Northern Rockies to portions of the Plains and Mississippi Valley as a cold high pressure system settles in behind the front. Freeze Warnings are in place for parts of the Southern/Central Plains to the Middle Mississippi Valley. A very warm Monday across the East, which could set widespread record high minimum temperatures, will give way to much cooler temperatures on Tuesday in the Mid-Atlantic and Northeast. Meanwhile, Florida remains south of the cold front and could have record-breaking heat again for the beginning of the workweek. Elsewhere, the Southwest could see showers in lower elevations with snow mixing in at higher elevations. Snow is expected to be persistent over the Central Rockies, with over 6 inches possible. Lighter snow could spread into the Southern and Central High Plains Monday into early Tuesday, meaning the Oklahoma and Texas Panhandles could see unusually late in the "season" snow. Light snow is also possible across the north-central tier. Tate Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php