Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 PM EDT Wed Sep 13 2017 Valid 00Z Thu Sep 14 2017 - 00Z Sat Sep 16 2017 ...Wet snow expected across the higher elevations of the northern Rockies Thursday evening into Friday... ...Remnants of Irma and a weak front will bring scattered showers and thunderstorms along the East Coast... A weak low pressure center over the Mid-Mississippi Valley, which is the remnants of Irma, is forecast to dissipating tonight. Scattered showers and some thunderstorms will then spread eastward across the central Appalachians Thursday morning. Some widely scattered showers are expected along the East Coast through Friday as a weak front lingers. Inland sections should gradually dry out as a large dome of cool air associated with Irma moves toward New England. Temperatures should return to normal levels across the eastern U.S. by Friday afternoon. Meanwhile, cool air from western Canada is forecast to spread southward into the northern Rockies behind a strengthening cold front. Temperatures ahead of the front will be above normal from much of the Plains States eastward across the Great Lakes into New England. However, cool air filtering in behind the cold front will be lifted along the slopes of the northern Rockies resulting in steady rain to continue across the lower elevations through Friday. Over the higher elevations, temperatures are forecast to be cold enough to support the season's first snowfall event through Friday. Moisture is expected to spread eastward into much of northern Plains on Friday with a good chance of rain and a chance of thunderstorms reaching the upper Midwest by Friday evening. Farther south, scattered showers and thunderstorms are expected to linger across the Great Basin into the central Rockies as a cold front approaches. In addition, summer-time showers and thunderstorms can be expected from the central Gulf coast eastward into Florida for the next couple of days. Kong Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php