Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 455 AM EDT Wed Jun 04 2014 Valid 12Z Wed Jun 04 2014 - 12Z Fri Jun 06 2014 ...Flash flooding and severe weather possible with an organized area of storms moving through the Ohio Valley on Wednesday... A large complex of storms that developed over the Middle Mississippi Valley on Tuesday will continue to propagate southeastward through the Ohio Valley on Wednesday. Vigorous energy aloft will help keep these storms organized while they move towards a moist and unstable airmass...allowing for heavy downpours...damaging winds...large hail...and even isolated tornadoes. The energy aloft will streak east of the Central Appalachians Wednesday night into Thursday...but the threat for flash flooding and severe weather should diminish as the storms lose some strength while moving southeastward through the Tennessee Valley and Mid-Atlantic states. Upstream from the storms moving through the Ohio Valley...a piece of energy ejecting out of the Rockies should help ignite another batch of organized storms over the Central Plains by early Thursday. These storms are expected to move southeastward towards the Missouri/Arkansas border...along a frontal boundary stretched through the region...and will also carry a risk of heavy downpours and severe weather. An upper trough will trigger showers and thunderstorms while it progresses from the Intermountain West to the Upper Mississippi Valley the next couple of days. Activity should be mostly scattered...but an organized area of convection containing moderate to heavy rains is expected to develop over the Dakotas Wednesday evening and move eastward into Minnesota by Thursday morning. Gerhardt Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php