Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 204 PM EDT Tue Jun 13 2017 Valid 00Z Wed Jun 14 2017 - 00Z Fri Jun 16 2017 ...Severe thunderstorms and heavy rain possible for portions of the Plains and the Midwest... ...Cooler temperatures expected for the Mid-Atlantic and Northeast over the next couple days while the central U.S. remains above average... A low pressure system will move northeastward across the northern plains and Upper Midwest tonight into Wednesday. Showers and thunderstorms are expected tonight across these regions, with severe thunderstorms and heavy rainfall possible. Farther south along the trailing frontal boundary, additional showers and thunderstorms are possible tonight across the southern and central plains. The Storm Prediction Center is forecasting a slight to enhanced risk of severe thunderstorms through tonight across a large area from the southern plains to the Upper Midwest. Please refer to products issued by the SPC for further details on the severe weather threat. On Wednesday, the primary surface low will lift north into Canada, but scattered showers and thunderstorms will still be possible across much of the Midwest and Upper Great Lakes. Farther south, the frontal boundary is forecast to become stationary across the southern/central plains, keeping scattered showers and thunderstorms a possibility through Thursday. As the northern portions of the system moves east, showers and thunderstorms are expected to become more widespread across the lower Great Lakes, Ohio valley, and the central Appalachians on Thursday. In the West, snow showers across the higher elevations of western Wyoming will gradually taper off tonight, with rain at the lower elevations as well as farther north across Montana. Otherwise, most of the west will remain dry until a Pacific low pressure system approaches the Northwest by Wednesday night into Thursday, spreading rain showers inland. After a hot start to the week, cooler temperatures are expected to spread across the Mid-Atlantic and Northeast beginning on Wednesday as a backdoor cold front moves through the region. High temperatures on Wednesday will remain in the 80s for many areas, with the 70s becoming more widespread by Thursday. Farther west, above average temperatures will continue across much of the central U.S. with highs in the 80s and 90s persisting for many areas. Ryan Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php