Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 405 PM EDT Tue Apr 23 2019 Valid 00Z Wed Apr 24 2019 - 00Z Fri Apr 26 2019 ...Severe thunderstorms and heavy rain could lead to flash flooding in parts of Texas through Thursday morning... ...Near record high temperatures across parts of the Desert Southwest... An upper-level trough interacting with a slow-moving frontal boundary will bring unsettled weather across the Deep South for the next couple of days. The best dynamics and moisture associated with this system will likely bring heavy rain and severe thunderstorms from west to east across Texas through Thursday morning. The heaviest rainfall is forecast to move from central Texas to northeastern Texas where flash flooding is possible. The best chance of severe thunderstorms should be concentrated across the southern half of the state. Temperatures will be much cooler than normal due to persistent clouds and precipitation. Sunshine should return across Texas on Thursday as a low pressure system is forecast to push the rain farther to the east into the lower and mid Mississippi Valley as well as the Tennessee Valley and parts of the Ohio Valley during the day. Excessive rainfall is not expected in these areas at this time as the system is forecast to gradually weaken. Over the Northeast, a low pressure system is expected to spread scattered showers and embedded thunderstorms through tonight. Colder air over northern New England will support wintry precipitation early on Wednesday and Wednesday night before the low departs into the Canadian Maritimes on Thursday. Out west, moisture ahead of a cold front is expected to bring mixed precipitation into the higher elevations of the northern Rockies through Thursday. Scattered showers and thunderstorms are expected across the Great Basin and central Rockies during the afternoon into early evening. Meanwhile, sunny and dry conditions under an upper-level ridge will bring near record high temperatures across parts of the Desert Southwest. Kong Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php