Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 349 AM EDT Wed Jun 22 2016 Valid 12Z Wed Jun 22 2016 - 12Z Fri Jun 24 2016 ...There is a slight risk with an embedded moderate risk of severe thunderstorms from parts of the Upper Mississippi Valley to parts of the Central Appalachians... ...Heavy rain possible from parts of the Middle Mississippi Valley to the Central Appalachians... A quasi-stationary front extending from the Mid-Atlantic roughly westward to the Central High Plains through Thursday into Friday while waves of low pressure travel along the boundary. Showers and thunderstorms will develop along and near the front from parts of the Northern Plains/Upper Mississippi Valley to the Ohio Valley/Mid-Atlantic through Thursday. On Thursday morning the showers and thunderstorms will end over the Northern Plains/Upper Mississippi Valley while continuing over the Ohio Valley to the Mid-Atlantic through Thursday evening. On Thursday afternoon into evening, showers and thunderstorms will develop over parts of the Central Plains eastward to the Western Ohio Valley. Additionally, upper-level energy moving across the Lower Great Lakes into Northern New England will produce rain over the region through late Wednesday night. Meanwhile, upper-level energy over the Central Rockies and daytime heating will aid in producing showers and thunderstorms over parts of the Central/Southern Rockies and Central/Southern High Plains during the afternoon and evening hours on Wednesday and Thursday. In addition, onshore flow off the Western Gulf of Mexico and the Atlantic along with daytime heating will produce showers and thunderstorms over parts of the Western/Central Gulf Coast and Southern Florida also on Wednesday and Thursday afternoon and evening. Furthermore, upper-level energy moving over the Pacific Northwest and onshore flow will aid in producing rain over parts the Northwest starting by Wednesday evening continuing into Thursday night/Friday morning. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php