Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 330 AM EST Wed Dec 09 2015 Valid 12Z Wed Dec 09 2015 - 12Z Fri Dec 11 2015 ...Heavy rain possible over the Pacific Northwest to Central California... ...Snow for parts of the Cascades, the Sierras, and the higher elevations of the Northern/Central Rockies... Fast upper-level flow will race multiple upper-level energy centers across the country through Thursday. One system will move over the Pacific Northwest and travel to the Great Lakes by Thursday night. A second system will move over the Pacific Northwest on Thursday morning move to the Northern/Central Rockies by Thursday evening. Multiple plumes of moisture from the Pacific will also move over parts of the West Coast through Thursday. The energy and moisture will aid in producing waves of rain and higher elevation snow from the Pacific Northwest to Central California eastward to parts of the Northern/Central Rockies through Thursday evening. Meanwhile, energy over the Mississippi Valley will quickly move eastward off the East Coast by Thursday morning. The system will produce light rain over parts of the Upper Great Lakes to parts of the Tennessee Valley moving eastward to the Lower Great Lakes/Ohio Valley by Wednesday evening. The rain will be limited to parts of the Northeast on Thursday morning. A second area of upper-level energy will move out of the Northern/Central Rockies late Wednesday night and move to the Upper Great Lakes/Upper Mississippi Valley by Thursday evening. The storm will produce light rain over parts of the Northern Plains Wednesday night moving to the Upper Great Lakes/Upper Mississippi Valley by Thursday. Elsewhere, diminishing moisture over Southern Florida will aid in producing scattered rain over the region through Thursday evening. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php