Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 212 PM EST Sat Nov 21 2015 Valid 00Z Sun Nov 22 2015 - 00Z Tue Nov 24 2015 ...Decent snowfall is expected downwind of the Great Lakes the next few days... ...Rain and higher elevation snow will begin moving into the Northwest U.S. by the end of the weekend... ...Cooler than average temperatures will spread from the Central U.S. to the Eastern U.S.... A deepening surface low will track across the upper Ohio Valley this evening and into southeast Canada by Sunday morning. With plenty of cold air in place to the north and west of the Low, snow, heavy at times, will continue to impact portions of the Great Lakes, upper Ohio Valley, and central/northern Appalachians. The heaviest of the snow will remain just to the north of the low, but favorable westerly flow on the backside of the system moving over the still warm Great Lakes could produce 2 to 6 inches of snow to places downwind over the next couple of days. Ahead of the cold front, rain with a few embedded thunderstorms, will impact places along the Eastern Seaboard and eastern Gulf Coast. The cold front should slide off the East coast on Sunday, ushering in a much cooler and dryer airmass behind. Temperatures across the eastern half of the country by the end of the weekend could be as much as 10 to 20 degrees below normal. Seems like a tale of two coasts here because just as the eastern system moves offshore, a system will begin moving towards the Northwest U.S.. This will allow for light rain and higher elevation snow to spread from the Pacific Northwest on Sunday, into the Great Basin and northern Rockies by Monday. Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php