Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 401 PM EDT Wed Jul 25 2018 Valid 00Z Thu Jul 26 2018 - 00Z Sat Jul 28 2018 ...Heavy rains will continue to raise flooding concerns across portions of the Mid-Atlantic and Northeast through Thursday morning... ...Strong to severe thunderstorms possible for portions of the northern and central Plains to the upper Midwest... ...Dangerous heat to continue across the Southwest and portions of the West Coast... ...Risk of heavy rainfall leading to flash flooding for the central/southern Rockies and central High Plains... Scattered to widespread showers and thunderstorms have developed over much of the Mid-Atlantic and Northeast regions as a deep layer of moisture streams northward of an advancing cold front. This system is expected to stall along the East Coast, which will continue to be a focus for organized convection through the end of the week. Slow storm movement, along with the nearly continuous moisture feed, will set the stage for widespread heavy rain amounts that results in flooding. Much of the Mid-Atlantic is water-logged from multiple days of heavy rain prior to this event and any additional rainfall will exacerbate the situation. WPC has much of this region in a slight risk, with moderate and high outlooks in affect from central Maryland to south-central New York. A cold front will pass through the Northern/Central Plains and lift to the northeast through the Great Lakes region. Showers and thunderstorms will accompany the front - some of these storms could be strong to severe--thus, the Storm Prediction Center has highlighted a slight risk for these regions. By Thursday, the showers and thunderstorms along the cold front will move toward the lower Great Lakes and the Ohio Valley. Hot and dry conditions will persist across much of the Southwest and parts of the western U.S. Numerous excessive heat warnings and heat advisories remain in effect through at least Thursday. Forecast highs will be near or above triple digits. Portions of the Southern/Central Rockies will have an increase risk for excessive rainfall and flash flooding- thunderstorms could produce flash flooding especially over favored terrain and recent burn scars. Campbell/Reinhart Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php