Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 407 AM EDT Sat Jun 17 2017 Valid 12Z Sat Jun 17 2017 - 12Z Mon Jun 19 2017 ...There is a slight risk of severe thunderstorms from parts of the Great Lakes/Ohio Valley to parts of the Middle Mississippi Valley/Central Plains... ...Heavy rain possible over parts of the Ohio and Tennessee Valleys... ...Heavy rain possible over parts of the Middle Mississippi Valley... Upper-level energy over the Northern High Plains will move eastward to the Upper Great Lakes by Sunday evening. The energy will produce an area of rain with embedded thunderstorms over parts of the Northern Rockies/Northern High Plains into parts of the Central Rockies/Northern Plains where the areal coverage will expand with diurnal heating and contract during the overnight hours. The rain with embedded thunderstorms will move eastward to the Northern Plains into parts of the Upper Great Lakes by Sunday evening. In addition, a developing front extending from the Central Plains/Middle Mississippi Valley westward to the Great Basin will move eastward to Great Lakes/Ohio Valley and southward to the Lower Mississippi Valley/Southern Plains by Sunday evening. Showers and thunderstorms will develop over parts of the Upper Great Lakes to parts of the Middle Mississippi Valley that will move eastward to the Lower Great Lakes/Ohio Valley by Sunday. As the boundary moves into the Middle Mississippi Valley/Central Plains, showers and thunderstorms will develop over parts of the Middle Mississippi Valley into the Central Plains that will move into parts of the Lower Mississippi Valley/Tennessee Valley by Sunday evening. Meanwhile, moist air over the Mid-Atlantic into Southern New England along with daytime heating will aid in producing showers and thunderstorms over the region through Sunday evening. The showers and thunderstorms will have a maximum in areal coverage during the late afternoon into the late evening on Saturday and Sunday. Additionally, upper-level energy over the Central Gulf Coast into parts of the Southeast will be quasi-stationary over the region through Sunday. Showers and thunderstorms will develop over the Central Gulf Coast into the Southeast that will continue over the area through Sunday evening. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php