Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 244 PM EST Sun Dec 28 2014 Valid 00Z Mon Dec 29 2014 - 00Z Wed Dec 31 2014 ...Temperatures will be 20 to 30 degrees below average over the Northern/Central Plains... ...Snow is forecast for the interior Western U. S.... Cold high pressure over Western Canada will force a front southward over the Northern Intermountain Region to Southern California/Southwest by Tuesday morning. Upper-level energy over the Pacific Northwest will move southward to the Great Basin by Tuesday, too. Weak upslope flow will aid in producing light snow over the Northern/Central Rockies will move southeastward to the Central/Southern High Plains by Tuesday. In addition, the upper-level energy will aid in producing light snow over parts of the interior Pacific Northwest to the Great Basin/Central Rockies will move southward to parts of Sierras in California to parts of the Great Basin also by Tuesday. Meanwhile, a front over the Southern Mid-Atlantic to the Lower Mississippi Valley will sink southeastward to the Florida peninsula by Tuesday morning. Moisture pooling along the boundary will aid in producing rain over the Lower Mississippi Valley to parts of the Mid-Atlantic will likewise move southward to Florida and the parts of the Mid-Atlantic Coast. Additionally, showers and thunderstorms will develop over parts of Eastern Florida Monday night into Tuesday. Elsewhere, upper-level impulses will trigger light snow over parts of the Upper Great Lakes through Tuesday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php