Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 339 AM EDT Thu Jul 27 2017 Valid 12Z Thu Jul 27 2017 - 12Z Sat Jul 29 2017 ...Heavy rain and strong storms likely for parts of the Four-Corners region and also from the Deep South to the Mid-Atlantic region... There will be two main areas of disturbed weather through the end of the week. The first area will be a developing surface low along a frontal boundary situated across the Ohio Valley and Mid-Atlantic region. Increasing moisture convergence along and south of this front will result in numerous showers and thunderstorms developing from the middle Mississippi River valley to the East Coast. The potential for flash flooding increases from Missouri to New Jersey over the next couple of days as multiple rounds of storms repeatedly affect the same areas. Some locations could get 2 to 4 inches of rainfall by Saturday morning, especially across parts of the northern Mid-Atlantic region. The increased cloud cover and precipitation will keep temperatures about 5 to 10 degrees cooler than they otherwise would be. The best prospects for severe storms will be from the southern Appalachians to the Southeast Coast based on the latest Storm Prediction Center outlooks. Parts of the Four Corners region will also have scattered showers and thunderstorms as monsoonal moisture interacts with a frontal boundary over the western High Plains. It appears that eastern Colorado and New Mexico will get the greatest rainfall totals through Friday, with a few instances of flash flooding possible. Across the southern Rockies, much of the initial thunderstorm activity should congregate across the local mountain ranges before migrating toward the valley floors. Much of the south-central U.S. will have another hot and humid day on Thursday ahead of the cold front where upper level ridging resides. Heat advisories are in effect from northeast Texas to western Tennessee where heat indices may reach 105 to 110 degrees during the afternoon hours. The heat should abate some by the weekend along with less humid conditions behind the front. Hamrick Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php