Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 348 AM EDT Fri May 12 2017 Valid 12Z Fri May 12 2017 - 12Z Sun May 14 2017 ...Rain and thunderstorms expected from the lower Mississippi to the mid-Atlantic/Northeast... ...Showers and thunderstorms, with mountain snow, forecast for the pacific Northwest/Intermountain West... Much of the eastern U.S. will be cooler and wet this weekend as a deep upper low and surface front slowly tracks through. Scattered to numerous showers and thunderstorms will focus along the slow moving boundary, stretching from the southern Plains/lower Mississippi valley to the Mid-Atlantic. Embedded areas of higher rainfall may lead to rapid off and local flash flooding -- especially across portions of the central Appalachians today and coastal areas of the Northeast on Saturday. A slow-moving front will pass through the Pacific Northwest, Intermountain West and Great Basin this weekend spreading rain showers and mountain snow as far east as the Northern High Plains. Temperatures will soar ahead of the frontal boundary-- high temperatures across the Great Basin to Northern Rockies could potentially reach 15 degrees above normal. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php