Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 342 PM EST Fri Nov 29 2013 Valid 00Z Sat Nov 30 2013 - 00Z Mon Dec 02 2013 ...Major precipitation event getting set up over the Northwest... Another day of light and scattered snow showers are expected over the Washington Cascades and extreme Northern Rockies on Saturday...but as a closed upper vortex begins to drop south out of the Gulf of Alaska on Sunday...conditions will become increasingly active across the northwestern corner of the Nation. Strong onshore flow bringing an onslaught of Pacific moisture inland will fuel heavy rains along the coastal ranges of Washington and Oregon and accumulating snows in the higher elevations of the Washington Cascades. Enough moisture should spill inland to also produce heavy snows along the Northern Rockies on Sunday. The weather will stay fairly quiet across the rest of the Nation for the remainder of the holiday weekend. A moisture starved system crossing the Great Lakes on Saturday and lifting through the Northeast on Sunday will trigger light snow showers...but any accumulations should stay north of the Canadian border. In the southern tier...cool northeasterly flow over relatively warm ocean waters could bring some scattered showers and thunderstorms into Florida's Atlantic coast. Light shower activity over southern California should gradually come to an end Friday night as closed low aloft drops southwestward away from the California coast. Gerhardt Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php