Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 429 AM EDT Fri Aug 12 2016 Valid 12Z Fri Aug 12 2016 - 12Z Sun Aug 14 2016 ...Heavy rain possible for the Lower Mississippi Valley and Central Gulf Coast... ...Heavy rain possible from parts of the Southern Plains to the Ohio Valley/Great Lakes... Upper-level low over the Central Gulf Coast/Lower Mississippi Valley will be quasi-stationary through Sunday. High moisture content air along the Gulf Coast will aid in producing showers and thunderstorms over the region with heavy rain possible through Sunday. In addition, daytime heating along with tropical moisture will aid in producing showers and thunderstorms over the Southeast with a maximum in areal coverage during the afternoon into the late evening hours from Friday into Sunday. Meanwhile, a front extending from the Great Lakes to the Southern High Plains will move very slowly southward to the Southern Plains while moving into the Western Ohio Valley and becoming quasi-stationary from the Great Lakes to New England through Sunday. Tropical moisture will pool along the boundary producing showers and thunderstorms along and near the front with heavy rain at times from the Southern High Plains to the Great Lakes and eastward into New England through Sunday. Additionally, upper-level energy over the Upper Mississippi Valley/Northern Plains will move eastward into the Upper Great Lakes by Sunday. Showers and thunderstorms will develop over the Upper Mississippi Valley on Friday morning that will move slowly eastward into the Upper Great Lakes by Saturday evening. Elsewhere, upper-level troughing and daytime heating will produce scattered showers and thunderstorms over parts of the Northern High Plains into the Northern Plains on Friday afternoon into evening. Furthermore, monsoonal moisture and daytime heating will aid in producing showers and thunderstorms over parts of the Southern/Central Rockies during the late afternoon into the late evening hours on Friday into Sunday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php