Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 348 PM EDT Wed Jul 26 2017 Valid 00Z Thu Jul 27 2017 - 00Z Sat Jul 29 2017 ...Severe weather/flash flooding are possible from the Middle Mississippi Valley to the Mid-Atlantic... ...Potential for flash flooding across areas of the Four Corners into the Southern Rockies... ...Heat advisories are in effect today across eastern Texas/Oklahoma/Kansas into the Ozarks... Much of the south-central U.S. will continue to be hot and mostly dry through the end of the week as an upper-level ridge remains in place. Excessive heat advisories are in effect for portions of the Southern/Central Plains, Mid and Lower Mississippi Valley where high temperatures will feel like 100 to 110+ degrees. Just to the north, scattered to widespread showers and thunderstorms are forecast from the Midwest to the Mid-Atlantic and Northeast as a series of disturbances move through the region. Some of these storms may become severe with the potential for embedded areas of heavy rainfall. The best potential for severe weather will be Friday, spanning from northern Alabama to the Del-Mar-VA region. Heavy rain and flash flooding may be a concern along the Iowa/Missouri border through Thursday morning. The risk area for excessive rainfall will shift eastward on Thursday, encompassing much of the Ohio Valley and central Appalachians. By Friday, the risk area will expand into the Mid-Atlantic and southern portions of the Northeast. Areal averages over the next three days be 1 to 3 inches over the Middle Mississippi and Ohio Valleys and 2 to 4 inches for the northern Mid-Atlantic. The increased cloud cover and precipitation will keep temperatures 5 to 10 degrees cooler. The Four Corners region will have scattered showers and thunderstorms as monsoonal moisture transports to the North. Areas of higher terrain of the Southern/Central Rockies will have an increased risk for flash flooding, particularly in prone locations like canyons. As usual, much of the initial thunderstorm activity should congregate across the local mountains before migrating toward the valley floors. The storms likely will wane into the overnight hours given the loss of heating. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php