Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 429 AM EDT Thu Jun 23 2016 Valid 12Z Thu Jun 23 2016 - 12Z Sat Jun 25 2016 ...Slight risk of severe thunderstorms from the Ohio Valley to the Mid-Atlantic... ...Slight risk of severe thunderstorms over parts of the Central High Plains... ...Heavy rain possible from parts of the Central Appalachians... A quasi-stationary front extending from the Mid-Atlantic roughly westward to the Central High Plains will have waves of low pressure travel along the boundary through Saturday. Showers and thunderstorms develop near the front from the Ohio Valley eastward to the Mid-Atlantic through Thursday. On Thursday afternoon into evening, showers and thunderstorms will develop over parts of the Central Plains eastward to the Western Ohio Valley and continue into the Mid-Atlantic through Friday evening. In addition, upper-level energy over the Upper Great Lakes will trigger showers and thunderstorms over parts of the Great Lakes that will settle into the Ohio Valley by early Friday morning. Meanwhile, upper-level energy along with daytime heating and ample moisture will come together producing showers and thunderstorms over parts of the Central/Southern Rockies and High Plains during the afternoon and evening hours of Thursday and Friday. Additionally, 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 Gulf Coast and Southern Florida also on Thursday and Friday afternoon and evening. A developing front over the Northern Intermountain Region/Northern Rockies will be the new wave of low pressure to develop along the quasi-stationary front starting Thursday morning. The wave will move eastward to the Northern High Plains into parts of the Great Basin by Friday evening. Showers and thunderstorms will develop over parts of the Northern Rockies/High Plains on Thursday evening that will dissipate by Friday morning. By Friday evening, showers and thunderstorms will develop over parts of the Northern Plain into the Central High Plains. In the wake of the boundary, onshore flow off the Pacific will develop rain over parts of the Pacific Northwest through Friday evening. The rain will move into parts of the Northern Intermountain Region overnight Thursday, expanding into the Northern Rockies by Friday evening. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php