Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 331 AM EDT Wed Jun 24 2015 Valid 12Z Wed Jun 24 2015 - 12Z Fri Jun 26 2015 ...There is a slight risk of severe thunderstorms from the Central High Plains to parts of the Middle Mississippi Valley/Ohio Valley... ...Heavy rain possible from the Middle Mississippi Valley to Ohio Valley/Central Appalachians... A quasi-stationary front extending from the Southern Mid-Atlantic westward to the Central High Plains will fluctuate north and south through Thursday. Showers and thunderstorms will develop over parts of the Central Plains/Middle Mississippi Valley on Wednesday morning, expanding into parts of the Ohio Valley by Wednesday evening. The showers and thunderstorms will continue to expand eastward into the Mid-Atlantic/Northeast on Thursday. Upslope flow will aid in producing showers and thunderstorms over parts of the Northern/Central High Plains on Thursday, too. Meanwhile, a weak secondary front just north of Lake Superior will move southward to the Lower Great Lakes before dissipating by Thursday evening. The boundary will aid in producing showers and thunderstorms over parts of the Upper Midwest on Wednesday moving into the Great Lakes by Thursday. In addition, upper-level energy over the Southeast will aid in producing showers and thunderstorms over the area through Thursday. Elsewhere, diurnal heating and weak upper-level energy will produce showers and thunderstorms over parts of the Southern/Central Rockies during the late afternoon and evening on Wednesday and Thursday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php