Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 403 AM EDT Sat Jul 18 2015 Valid 12Z Sat Jul 18 2015 - 12Z Mon Jul 20 2015 ...There is a slight risk of severe thunderstorms from the Great Lakes to the Middle Mississippi Valley... ...Heavy rain possible for parts of the Middle Mississippi Valley... Weak upper-level energy and a plume of moisture over the Mid-Atlantic into the Northeast will aid in producing showers and thunderstorms over parts of the Central Appalachians to the Northern New England that will slowly move off the Northeast Coast by Sunday morning. In addition, moisture pooling over the Southeast and upper-level impulses rotating southeastward around an upper-level high over the Lower Mississippi Valley will trigger showers and thunderstorms over parts of the Southeast into parts of the Central Gulf Coast through Sunday evening. A front extending from the Upper Midwest to the Central High Plains will move eastward to the Great Lakes southwestward to the Southern High Plains by Sunday. The boundary will aid in producing showers and thunderstorms along and near the front from the Upper Mississippi Valley to the Central Plains that will move eastward to the Northeast/Lower Great Lakes/Ohio Valley to the Central Plains by Sunday. Additional upper-level energy over the Great Basin will move to the Northern High Plains by Sunday evening. The energy will aid in producing rain over parts of the Great Basin/Northern Rockies on Saturday morning. As the energy begins to move, showers and thunderstorms will develop over parts of the Northern/Central Rockies into parts of the Central High Plains by Saturday evening that will continue to Sunday evening. Additionally, monsoonal moisture and diurnal heating will aid in producing showers and thunderstorms over parts of the Southwest into parts of the Great Basin and the Southern Rockies by Sunday. Furthermore, moisture from T. S. Dolores will move into parts of Southern California on Sunday producing showers and thunderstorms. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php