Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 AM EST Sun Dec 08 2013 Valid 12Z Sun Dec 08 2013 - 12Z Tue Dec 10 2013 ...Snow is expected from the Middle Missouri Valley into the Great Lakes... ...Snow will change over to freezing rain then to rain from parts of the Ohio/Tennessee Valleys to the Mid-Atlantic/Southern New England... ...Heavy rain possible from parts of the Lower Mississippi Valley/Central Gulf Coast to the Tennessee Valley... A complex storm forming over the Central Gulf Coast/Tennessee Valley will move northward to the Great Lakes/Ohio Valley then into Southeastern Canada/New England by Monday evening. The system will pull moisture off the Gulf of Mexico northward overrunning the associated front over the Southeast/Central Gulf Coast into the cold air from the Middle Mississippi Valley to the Mid-Atlantic. A band of snow will develop over parts of the Middle Mississippi/Ohio Valleys into the Mid-Atlantic that will move northward into the Lower Great Lakes to New England by Monday morning. The snow will be forced out by a band of freezing rain/sleet that will, likewise, move northward from the Tennessee Valley/Southern Mid-Atlantic into the Northern Appalachians/Southern New England also by Monday morning. Rain will develop over parts of the Western Gulf Coast to the Carolinas that will similarly move northward into the Northern Mid-Atlantic/New England by Monday evening, with snow over the interior of Northern New England/Northern Appalachians, too. Showers and thunderstorms will develop along and ahead of the front over the Central Gulf Coast moving into the Southeast/Southern Mid-Atlantic by Monday evening. Behind the boundary, rain will continue over parts of the Western Gulf Coast to the interior Southeast/Southern Mid-Atlantic by Monday evening. Meanwhile, upper-level energy over the Southern Rockies will move northeastward to the Great Lakes/Southeastern Canada by Monday. The energy will trigger light snow over parts of the Southern/Central Rockies that will end by Sunday evening. A new area of snow will develop over parts of the Middle Missouri Valley that will expand into the Great Lakes by Sunday evening into Monday morning. Lake effect snow will develop over the Upper Great Lakes on Monday evening. Some additional upper-level energy will move over the Southwest/Southern Rockies by Monday evening. A small area of snow will develop over parts of the Southwest/Southern Rockies early Monday morning, that will begin to wane by Monday evening. In addition, a developing front over West-Central Canada will move southeastward into the Northern Plains by Monday evening. The system will produce light snow over parts of Northern High Plains early Monday morning, moving into parts of the Northern Plains/Upper Mississippi Valley by Monday evening. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php