Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 405 PM EDT Tue Jul 23 2019 Valid 00Z Wed Jul 24 2019 - 00Z Fri Jul 26 2019 ...Much cooler than normal temperatures prevail across much of the eastern two-thirds of the U.S.... ...A slight risk of excessive rainfall from the Gulf Coast, Southeast, to the Mid-Atlantic, where severe thunderstorms are possible tonight... It appears that much of the eastern two-thirds of the country will be dominated by cooler than normal temperatures for the next few days, as a high pressure system ushers in much cooler air behind a strong cold front, offering welcoming relief from the recent heat wave. Showers and thunderstorms associated with the cold front will stretch along the Gulf Coast, across the Southeast and much of the Mid-Atlantic through tonight as the front slowly moves off the coast by Wednesday morning. The rain could be heavy enough to lead to flash flooding from the central Gulf Coast northeastward through the Carolinas through tonight. Thunderstorms could be severe over North Carolina at first. Afternoon high temperatures are expected to only reach the 70's and 80's for much of the eastern two-thirds of the country for the next couple of days. Meanwhile, monsoonal moisture is expected to move into parts of the interior southwestern U.S. and across the southern and central Rockies. Daytime heating will help trigger showers and thunderstorms over the region during the late afternoon into the evening hours for the next couple of days. The rain could be heavy enough to result in flash flooding in Arizona and parts of the Intermountain region tonight. Meanwhile, heat will briefly affect the northern Rockies into the northern Plains before a cold front brings cooler air down from western Canada. Thunderstorms could become severe from the northern Plains to the upper Midwest by Thursday afternoon ahead of the advancing cold front. Kong Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php