Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 309 PM EST Sun Nov 16 2014 Valid 00Z Mon Nov 17 2014 - 00Z Wed Nov 19 2014 ...A fresh surge of Arctic air will bring another dose of winter weather to the central and eastern U.S... ...Heavy snow possible from the Ohio Valley to portions of the Northeast... ...Severe thunderstorms possible across portions of the central and eastern Gulf Coast states... A large upper-level trough will amplify across the central and eastern U.S. during the short range forecast period, ushering another round of Arctic air into these areas behind a cold front. A wave of low pressure at the surface will develop along a lingering frontal boundary near the Gulf Coast and move northeastward into the Tennessee valley tonight and into the Northeast by Monday afternoon. Cold air is already in place across most of the central and eastern U.S., thus expect the potential for widespread wintry precipitation for many areas from the southern plains to the Northeast in association with the low pressure system as it moves northeastward. Heavy snow is possible in some areas. Across southern portions of the Gulf Coast states, warm and moist air ahead of the low pressure system will result in the potential for showers and thunderstorms, some of which could be severe through Monday. Please refer to the Convective Outlooks products issued by the Storm Prediction Center for further information on the threat of severe weather. Another unseasonably cold Arctic air mass will invade most of the central and eastern U.S. in the wake of the frontal system, with forecast temperatures on Monday and Tuesday 20 to 40 degrees below average for many locations. Meanwhile, high pressure aloft and at the surface will keep the western U.S. dry with during the forecast period. Ryan Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php