Prognostic Meteorological Discussion
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163 FXUS01 KWBC 080751 PMDSPD SHORT RANGE FORECAST DISCUSSION NWS WEATHER PREDICTION CENTER COLLEGE PARK MD 251 AM EST THU DEC 08 2016 VALID 12Z THU DEC 08 2016 - 12Z SAT DEC 10 2016 ...HEAVY SNOW AND RAIN POSSIBLE OVER THE SIERRAS... ...HEAVY SNOW POSSIBLE IN FAVORED AREAS DOWNWIND FROM THE GREAT LAKES... ...AREAS OF RAIN AND FREEZING RAIN POSSIBLE OVER INTERIOR PORTIONS OF THE PACIFIC NORTHWEST... ...TEMPERATURES WILL BE 15 TO 35 DEGREES BELOW AVERAGE OVER THE ROCKIES AND HIGH PLAINS... A FRONT OFF THE WEST COAST WILL MOVE ONSHORE OVERNIGHT THURSDAY MOVING INTO THE PACIFIC NORTHWEST, GREAT BASIN, AND CENTRAL CALIFORNIA BY FRIDAY EVENING. THE STORM WILL PRODUCE RAIN AND HIGHER ELEVATION SNOW OVER NORTHERN/CENTRAL CALIFORNIA THAT WILL EXPAND INTO PARTS OF THE GREAT BASIN AND THE PACIFIC NORTHWEST ON THURSDAY. OVERNIGHT THURSDAY, THE SNOW WILL EXPAND INTO PARTS OF THE NORTHERN/CENTRAL ROCKIES INTO FRIDAY EVENING. THE SNOW LEVELS WILL RISE OVER CALIFORNIA OVERNIGHT THURSDAY AS WELL. IN ADDITION, THERE WILL BE POCKETS OF RAIN/FREEZING RAIN OVER SOME OF THE INTERIOR PORTIONS OF THE PACIFIC NORTHWEST. MEANWHILE, UPPER-LEVEL ENERGY AND FAVORABLE UPPER-LEVEL FLOW WILL AID IN PRODUCING LAKE EFFECT SNOW DOWNWIND FROM THE GREAT LAKES INTO PARTS OF NORTHERN NEW ENGLAND THROUGH FRIDAY EVENING. ADDITIONALLY, UPPER-LEVEL ENERGY MOVING OVER THE WESTERN AND CENTRAL GULF COAST STATES WILL AID IN PRODUCING RAIN OVER PARTS OF THE SOUTHERN PLAINS AND THE LOWER MISSISSIPPI VALLEY THROUGH FRIDAY MORNING. RAIN AND EMBEDDED THUNDERSTORMS WILL ALSO DEVELOP OVER THE SOUTHERN PORTION OF FLORIDA THROUGH FRIDAY EVENING. ZIEGENFELDER GRAPHICS AVAILABLE AT WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_WBG.PHP $$

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