Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 318 PM EDT Sat Sep 08 2018 Valid 00Z Sun Sep 09 2018 - 00Z Tue Sep 11 2018 ...Heavy to excessive rainfall will continue across the Ohio valley and into parts of the Northeast this weekend... ...Additional heavy rainfall possible from central Texas into the lower Mississippi Valley... The low pressure center that once was tropical depression Gordon has been absorbed into a frontal system and has become extratropical. Regardless though, deep tropical moisture will continue to intersect this system to produce heavy rainfall and the threat for significant flooding across parts of the Ohio Valley, where WPC currently has a moderate to high risk for excessive rainfall/flash flooding effective through tonight, with a moderate risk continuing into the eastern Ohio Valley/lower Great Lakes tomorrow. Heavy rainfall will also be possible farther east into the Mid-Atlantic and the Northeast as this system continues to track northeastward through the weekend. These regions have been highlighted within a slight risk on the Days 2 and 3 WPC excessive rainfall outlooks. Farther south, the trailing cold front will allow for organized showers and thunderstorms from parts of the southern Plains to the Tennessee Valley as well, where WPC has highlighted much of this area in a slight risk for excessive rainfall as well through Saturday. Behind this system, cold air has begun filtering into the central U.S. where temperatures could be as much as 10 to 15 degrees below normal through the weekend. Expect colder than normal temps to the north of the quasi-stationary boundary in the Mid-Atlantic where a handful of record low maximums are possible. Elsewhere across the country, lingering moisture ahead of this main frontal system will keep scattered showers and storms across the Southeastern states, while another frontal boundary crossing the Northern Plains Sunday into Monday may bring a few showers and thunderstorms to the Dakotas and into the Upper Mississippi Valley. A deep upper level low lingering just off the British Columbia coast may also allow for light to moderate showers across parts of the Pacific Northwest through Monday. Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php