Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 316 AM EST Tue Nov 11 2014 Valid 12Z Tue Nov 11 2014 - 12Z Thu Nov 13 2014 ...Temperatures will be 20 to 40 degrees below average from the just east of the Rockies to the Plains... ...Snow over the Great Lakes will slowly wind down... A strong front extending from the Great Lakes southwestward to the Southern Plains will move eastward to the East Coast and out over parts of the Gulf of Mexico by Wednesday evening. Cold high pressure over Western Canada will move into the Northern/Central High Plains also by Wednesday. The system will produce light to moderate snow over the Upper Great Lakes through Tuesday evening. Light snow will continue over parts of the Upper Great Lakes through Wednesday evening. Rain will develop along the boundary from the Great Lakes southward to the Lower Mississippi Valley that will move to the Central Appalachians to the Lower Mississippi Valley by Wednesday morning, then ending by Wednesday afternoon. In addition, rain will move into the Northeast on Wednesday morning, ending later Wednesday evening. Additionally, showers and thunderstorms will develop over parts of the Western Gulf Coast on Tuesday morning moving to the Lower Mississippi Valley by Tuesday evening. The stability of the air mass will increase on Wednesday with the showers and thunderstorms changing over to rain along the Western Gulf Coast. Meanwhile, upslope flow associated with high pressure northeast of the Rockies will aid in producing light snow over parts of the Northern/Central Rockies through Wednesday evening. Furthermore, low pressure off the Southeast Coast will move northeastward, gradually moving farther out over the Atlantic Ocean by Wednesday. The system will produce showers and thunderstorms along parts of the Southeast Coast and into the Southern Mid-Atlantic Coast on Tuesday before ending overnight Tuesday. By Wednesday evening, a new system will approach the West Coast bring light to moderate rain to parts of Northern California and Southwestern Oregon. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php