Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 AM EDT Fri Jul 06 2018 Valid 12Z Fri Jul 06 2018 - 12Z Sun Jul 08 2018 ...Flash flooding possible for portions of the central Appalachians and Mid-Atlantic... ...Cooler temperatures on the way for much of the eastern U.S... Showers and thunderstorms will develop along and ahead of a cold front as it crosses the Appalachians and moves through much of the Eastern Seaboard. Locally heavy rain and flash flooding may be possible from portions of the Tennessee Valley, Southern/Central Appalachians to the Mid-Atlantic. This front will continue to advance south and east, along with the expected area of showers and thunderstorms, as high pressure builds behind it. The front will stall over the Gulf states and will continue to be a focus for convection through the weekend. Additional showers and thunderstorms are expected along the western portion of the frontal boundary, from the central High Plains to the Front Range of the Rockies, with the potential for areas of heavy rain. Cooler and drier air will spread into the central and eastern states over the next few days- a much needed reprieve from the recent heatwave. Mid to Upper-level ridging will allow much of the western states to be warmer than seasonal average this weekend. Some locations across the Northern Rockies/High Plains may reach 10 to 15 degrees above normal for early July. Isolated to scattered showers and thunderstorms will be possible as a cold front moves into the the High Plains. Across the Southwest, scattered afternoon/evening thunderstorms are expected daily as some monsoonal moisture begins to spread into the region. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php