Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 339 PM EDT Thu Oct 11 2018 Valid 00Z Fri Oct 12 2018 - 00Z Sun Oct 14 2018 ...Heavy rainfall and flash flooding to continue this evening across the Carolinas and Mid-Atlantic as Michael moves offshore... ...Rains ahead of Sergio will begin on Friday for the Southwest moving into the Southern Plains by the weekend... ...Temperatures across the central U.S. could be as much as 10 to 20 degrees below normal across the Plains and the Midwest... Tropical Storm Michael, currently located in western North Carolina, will move off the Mid-Atlantic Coast this evening and transition to Post-Tropical as it races northward off the Northeast coastline. Heavy rainfall associated with Michael will continue across the Carolinas and the Mid-Atlantic tonight, with life-threatening flash flooding possible, especially across parts of Virginia and the Delmarva where WPC has a high risk of excessive rainfall. Storm total rainfall of 4 to 7 inches, with locally higher amounts, are possible from western North Carolina to Southeast Virginia. Expect tropical-storm force winds to continue across parts of the Southern Mid-Atlantic tonight, along with a tornado threat. Moisture from Michael will also be pulled northward into southern New England the evening as a strong cold front moves in from the west. Tropical Storm Sergio will make landfall by Friday along the Baja California Coast, weakening as it moves east-northeastward into Northern Mexico. Moisture from Sergio may begin streaming into the Southwest tomorrow, with heavy rainfall and flash flooding possible. By the weekend, the remnants should move into the Southern Plains which will again bring a threat for heavy rainfall and flash flooding mainly across the Texas Panhandle and into Oklahoma. WPC has highlighted this region in a slight to moderate risk for excessive rainfall. Please refer to the NHC for the latest information on both Michael and Sergio. Elsewhere, broad troughing across the west and central parts of the country will continue possibly heavy mountain snows in the Central Rockies this evening, with rain or even a few snow flurries moving into the Central Plains on Friday. Also across the nations Mid-Section, expect afternoon high temperatures to be as much as 10 to 20 degrees below normal, with freeze warnings and frost advisories in effect for portions of the Upper Midwest. Across the Southwest, an upper-level closed low moving down along the California coast will allow for rain to develop across Southern California and Arizona on Friday night into Saturday. Locally heavy rainfall is possible, especially along the favored terrain. Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php