Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 356 AM EDT Sun Oct 29 2017 Valid 12Z Sun Oct 29 2017 - 12Z Tue Oct 31 2017 ...Tropical Storm Philippe will become absorbed into frontal zone along the East Coast by Monday morning... ...Severe thunderstorms and heavy rain possible over the Northeast/Northern Mid-Atlantic... ...Light to moderate snow possible over parts of the Upper Great Lakes, Central Appalachians, and parts of the Northern/Central Rockies... Heavy thundershowers are forecast for much of the Mid-Atlantic and Northeast today as a cold from tracks through the eastern states and warm, moist air advects onshore from the Atlantic Ocean. Portions of the Mid-Atlantic have a marginal risk for severe thunderstorms to develop this afternoon and evening. Low pressure along the boundary over the Southern Appalachians will rapidly deepen while moving northward to the Northern Appalachians by Monday morning. Rain, heavy at times, will develop along the front from the Central Appalachians to the Lower Great Lakes/Northern Appalachians and will spread to the Northeast/Northern Mid-Atlantic by this afternoon. Meanwhile, Tropical Storm Philippe is expected to become absorbed as triple point low over Southeastern Canada. See the latest advisory from the National Hurricane Center for the most up to date information on storm track and intensity. Rain, heavy at times, will develop over parts of Northern New England on Monday. Additionally, light snow will develop over parts of the higher elevations of the Central Appalachians overnight Sunday ending on Monday morning. Another surge of cold air will move through the central U.S. as a low pressure system moves southeastward to the Upper Great Lakes/Western Ohio Valley southwestward into the Southern High Plains by Monday. Rain will develop from the Northern high Plains to Upper/Middle Mississippi Valley tonight; and into parts of the Upper Great Lakes by Monday. Light to moderate snow will develop over parts of the Northern/Central Rockies through the overnight hours- some localized areas may have accumulations of 4 to 8 inches. Light snow will also be possible for portions of the Upper Mississippi Valley/Upper Great Lakes tonight through Monday. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php