Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 345 PM EDT Wed Apr 29 2020 Valid 00Z Thu Apr 30 2020 - 00Z Sat May 02 2020 ...There is a Slight Risk of Excessive Rainfall for portions of the Central/Southern Appalachians and for SE Wisconsin/NE Illinois through Thursday morning... ...There is a Slight Risk of Excessive Rainfall Friday for portions of the Mid-Atlantic to southern New England... ...Temperatures will be 10 to 20 degrees above average over parts of the Southwest, Great Basin, and parts of the Rockies... Scattered to widespread showers and thunderstorms are expected along and ahead of a cold front passing that will pass through eastern third of the country. The strong, possibly severe, thunderstorms will be capable of producing heavy rainfall across portions of the Lower Great Lakes/Ohio Valley, Tennessee Valley, Southeast, Mid-Atlantic and portions of the Northeast through Thursday morning. WPC has a Slight Risk for Excessive Rainfall in effect for parts of the Central/Southern Appalachians, as well as, areas near and north of the Chicago metro area. The area of heavy rainfall and increased risk for flash flooding will shift to the Mid-Atlantic to southern New England region by Friday-- where a Slight and Marginal Risk is now in effect. High pressure across much of the Southwest and Southern U.S. will keep daily temperatures well above seasonal normal for late April and early May. Daily reading may be as much of 10 to 20 degrees above average. 100 degrees. By Thursday, some of this very warm air will begin to shift eastward and should begin to advance out across the High Plains as the ridge shifts eastward in response to an upper trough approaching the West Coast. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php