Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 435 PM EDT Tue Jul 28 2015 Valid 00Z Wed Jul 29 2015 - 00Z Fri Jul 31 2015 ...Severe thunderstorms possible across the Middle Mississippi Valley... ...Flash flooding possible portions of the Great Basin, Southern Plains and Middle Mississippi Valley... ...Above normal temperatures to prevail across the West Coast... A strong upper trough will move through central and eastern portions of the U.S over the next few days. Widespread precipitation is expected with the northern portion of the frontal system as it tracks across the northern Plains, the Canadian Prairies and the Upper Midwest. Conditions that are favorable for severe thunderstorms will develop near the central section of the front on Wednesday. Portions of the Upper Mississippi Valley, Iowa and northern Missouri could observe excessive rainfall, with possible flash flooding. Scattered areas of showers and thunderstorms are expected along and ahead of the southern section of the front as it moves into the Mid-Atlantic, the Southeast and Southern Plains by Friday. Thunderstorms that develop over Northeast New Mexico and the panhandles of Texas and Oklahoma may produce heavy rain on Thursday and Friday; which, may lead to flash floods. A ridge will rebuild over the West in the wake of the strong frontal system. Temperatures will climb above seasonal normals for the West Coast. Many locations may observe temperatures around 10 to 15 degrees warmer than typical those in late July. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php