Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 359 AM EDT Sat Jun 09 2018 Valid 12Z Sat Jun 09 2018 - 12Z Mon Jun 11 2018 ...Severe weather possible for portions of the Northern Plains trough Monday morning... ...Heavy rain possible over parts of the Middle Mississippi/Ohio Valleys into parts of the Mid-Atlantic... The north-central portion of the U.S. will be in an active wet pattern this weekend. Scattered to widespread thunderstorms are expected to fire up across parts of Montana and the Northern High Plains today, shifting eastward across the Midwest and Ohio Valley Sunday and Monday. Adequate moisture and instability across the Plains will be favorable for strong to severe thunderstorms. The Storm Prediction Center has a slight risk for parts of Montana and the Dakotas and Iowa/Missouri this weekend. Heavy rain within these storms can also be expected along the frontal boundary extending from the Dakotas to the Ohio Valley. Showers and thunderstorms will be possible over parts of the Southeast and Mid-Atlantic through Sunday in association with an upper-level low over Florida. The western Gulf Coast states will also have showers and thunderstorms this weekend as Gulf moisture feeds into the area east of a dryline. Meanwhile, a slow moving front extending from parts of the Pacific Northwest southward into Northern/Central California will move eastward to the Northern High Plains into the Great Basin by Sunday. A deep upper-level trough associated with the front will, similarly, move slowly eastward inland over the West Coast. Rain will spread across the Pacific Northwest, northern California and into the Intermountain West as the system advances through the region. Some of the higher terrain may have snow as temperatures cool in the wake of the front in the Cascades. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php