Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 245 AM EST Wed Nov 12 2014 Valid 12Z Wed Nov 12 2014 - 12Z Fri Nov 14 2014 ...Heavy precipitation possible over parts of the Pacific Northwest... ...Freezing rain possible over parts of the Pacific Northwest... ...Temperatures will be 25 to 40 degrees below average east of the Rockies to the Plains and parts of the Middle Mississippi Valley... Very cold high pressure over the Northern High Plains will sink southeastward to the Central Plains by Thursday evening. Temperatures associate with this air mass will be significantly below average. Along the leading edge of the cold air, a front extends from the Northern Appalachians to the Mid-Atlantic then southwestward to the Central Gulf Coast that will move off the East Coast by late Wednesday night. Energy associated with the boundary will produce light to moderate rain over parts of the Northern Appalachians that will move off the Northeast Coast by late Wednesday afternoon. In the cold air behind the front, light snow will develop over parts of the Upper Midwest tapering off to the Upper Great Lakes by Wednesday evening. Lake enhanced snow will linger over the Great Lakes through Thursday evening. Additionally, upslope flow will aid in producing light snow over parts of the Central Rockies through Thursday. Meanwhile, scattered light rain over parts of the Central/Southern Appalachians will come to an end by Wednesday afternoon. In addition, upper-level energy moving along the Gulf Coast will trigger light rain over parts of the Western Gulf Coast through Thursday morning. As the energy moves off the Southeast Coast by Thursday evening, light rain will develop over parts of the Carolina Coast. A front over the Eastern Pacific will move into the West Coast and dissipate as the associated energy enters an area of upper-level ridging. Moisture associated with the system will move into the West Coast overrunning the cold air associate with the cold high pressure over the Plains. Rain will move into the California Coast by Wednesday evening, becoming light to moderate over parts of Northern California/Oregon on Thursday. Moderate snow will develop over parts of the higher elevations of Oregon also on Thursday, with pockets of freezing rain developing over parts of the Washington/Oregon Cascades. By Thursday evening, light snow will expand over parts of the Northern Intermountain Region and the Northern/Central Rockies. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php