Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 412 PM EDT Fri Jun 01 2018 Valid 00Z Sat Jun 02 2018 - 00Z Mon Jun 04 2018 ...There is a slight risk of severe thunderstorms over parts of the Southeast/Tennessee Valley... ...There is a slight risk of severe thunderstorms over parts of the Northern/Central Plains... ...Heavy rain possible over parts of the Mid-Atlantic and Northern/Central Plains... A deep upper-level trough over the eastern third of the country will form an upper-level low over the Mid-Atlantic overnight Saturday into Sunday morning. Moisture rich air over the region along with daytime heating will aid in producing showers and thunderstorms from the Northeast southwestward to the Central/Eastern Gulf Coast on Friday evening. Overnight Friday the moisture will move off the Northeast Coast as the showers and thunderstorms end by Saturday morning. The showers and thunderstorms will continue over Mid-Atlantic to the Ohio/Tennessee Valleys into the Southeast through Sunday with a strong diurnal component to the areal coverage. Meanwhile, a front extending from Northern/Central Plains into the Southwest will move eastward and southward to the Great Lakes and the Ohio/Tennessee Valleys into the Lower Mississippi Valley/Western Gulf Coast by Sunday. The system will produce showers and thunderstorms over parts of the Northern Rockies into the Northern Plains that will move into the Upper/Middle Mississippi Valley by Saturday morning. As the showers and thunderstorms move into the Great Lakes/Ohio Valley overnight Saturday the convection will expand southwestward into the Lower Mississippi Valley/Southern Plains. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php