Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 254 AM EDT Tue Sep 20 2016 Valid 12Z Tue Sep 20 2016 - 12Z Thu Sep 22 2016 ...Stalled front to bring heavy rain to portions of the Southeast and southern Mid-Atlantic today... ...Thunderstorms with heavy rain possible across portions of the Midwest on Wednesday... ...Unsettled weather expected to develop across the western U.S. by Wednesday... A stationary frontal boundary along with the remnants of Tropical Storm Julia will bring showers and thunderstorms with potentially heavy rainfall to portions of the Southeast and southern Mid-Atlantic regions today. Rainfall amounts may exceed two inches for portions of northeastern North Carolina and southeastern Virginia. This setup will change very little through midweek, with the frontal boundary remaining largely stationary as the surface low pressure area slowly weakens. As a result, expect at least scattered showers and thunderstorms to persist across much of the southeastern U.S. into Thursday. A wave of low pressure will develop along a frontal boundary across the central/northern plains later today, resulting in scattered thunderstorms this afternoon across portions of the Midwest. On Wednesday, as an upper-level disturbance approaches, showers and thunderstorms will become much more numerous from the Midwest to the Upper Great Lakes. Some of these storms may produce heavy rainfall. Farther west, scattered showers and thunderstorms will be possible today across the Southeast as moisture associated with Tropical Storm Paine streams north into the region. By Wednesday, a rather substantial upper-level trough will move into the Pacific Northwest, eventually closing off into an upper-level low. This upper low and its associated surface low pressure system will bring scattered to numerous showers and thunderstorms to much of the interior West on Wednesday, with rain and storms becoming more widespread Wednesday night into Thursday. Much of the central and eastern U.S. will see above average temperatures through the next couple days as upper-level high pressure builds from the southern plains into the Ohio valley. High temperatures today are forecast to be 10 to 15 degrees above average across a wide area from the central High Plains to the Northeast. These warm temperatures will persist into Wednesday as well. The one exception will be portions of the Southeast and southern Mid-Atlantic regions, where clouds and areas of precipitation will keep temperatures near or slightly below seasonal averages. Ryan Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php