Prognostic Meteorological Discussion
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033
FXUS01 KWBC 070902
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
402 AM EST WED DEC 07 2016

VALID 12Z WED DEC 07 2016 - 12Z FRI DEC 09 2016

...HEAVY SNOW POSSIBLE OVER THE SIERRAS...

...HEAVY SNOW POSSIBLE IN DOWNWIND FAVORED AREAS FROM THE GREAT
LAKES...

...RAIN/FREEZING RAIN POSSIBLE OVER INTERIOR PORTIONS OF THE
PACIFIC NORTHWEST/NORTHERN CALIFORNIA...

...TEMPERATURES WILL BE 15 TO 35 DEGREES BELOW AVERAGE OVER THE
NORTHERN/CENTRAL ROCKIES AND HIGH PLAINS...

DEEP LOW PRESSURE JUST NORTH OF THE GREAT LAKES WILL SLOWLY MOVE
NORTHEASTWARD TO JUST EAST OF JAMES BAY BY THURSDAY EVENING.  THE
ENERGY WILL PRODUCE SNOW OVER PARTS OF THE NORTHERN PLAINS TO THE
UPPER GREAT LAKES THROUGH THURSDAY WITH THE SNOW ENDING OVER THE
NORTHERN PLAINS AND THE UPPER MISSISSIPPI VALLEY ON THURSDAY
AFTERNOON INTO EVENING.  THE ASSOCIATED UPPER-LEVEL LOW WILL PASS
JUST NORTH OF THE KEWEENAW PENINSULA ON WEDNESDAY THAT WILL AID IN
PRODUCING THE HEAVIEST SNOW OVER THAT REGION OF THE GREAT LAKES.
THE LAKE EFFECT/ENHANCED SNOW WILL MOVE INTO THE LOWER GREAT LAKES
ON THURSDAY MORNING INTO EVENING.  IN ADDITION, A FRONT EXTENDING
FROM THE LOWER GREAT LAKES/NORTHERN APPALACHIANS SOUTHWARD TO THE
SOUTHEAST WILL MOVE EASTWARD OFF THE EAST COAST BY THURSDAY
MORNING.  HIGHER ELEVATION SNOW AND RAIN WILL DEVELOP OVER PARTS
OF THE CENTRAL APPALACHIANS/LOWER GREAT LAKES EASTWARD TO THE
NORTHEAST/NORTHERN MID-ATLANTIC THAT WILL SLOWLY WIND DOWN WEST TO
EAST OVERNIGHT WEDNESDAY.

MEANWHILE, UPPER-LEVEL ENERGY OVER THE GREAT BASIN/CENTRAL ROCKIES
WILL MOVE EASTWARD TO THE NORTHEAST BY THURSDAY EVENING.  THE
ENERGY WILL AID IN PRODUCING SNOW OVER PARTS OF THE GREAT BASIN
INTO PARTS OF THE CENTRAL HIGH PLAINS ON WEDNESDAY MORNING ENDING
BY WEDNESDAY EVENING.  UPPER-LEVEL JET DYNAMICS WILL AID IN
PRODUCING RAIN OVER PARTS OF THE WESTERN GULF COAST STARTING
OVERNIGHT WEDNESDAY THAT WILL EXPAND INTO THE LOWER MISSISSIPPI
VALLEY AND SOUTHERN PLAINS ON THURSDAY RETREATING TO THE SOUTHERN
TIP OF TEXAS BY THURSDAY EVENING.  FURTHERMORE, A BOUNDARY MOVING
OVER SOUTHERN FLORIDA WILL AID IN PRODUCING SHOWERS AND
THUNDERSTORMS OVER THE REGION WEDNESDAY MORNING INTO THURSDAY
EVENING.

ELSEWHERE, A FRONT OVER THE EASTERN PACIFIC WILL APPROACH THE WEST
COAST WEDNESDAY INTO THURSDAY.  A PLUME OF MOISTURE ASSOCIATED
WITH THE SYSTEM WILL BEGIN TO MOVE ONSHORE OVER CALIFORNIA ON LATE
WEDNESDAY MORNING, EXPANDING INTO PARTS OF THE PACIFIC NORTHWEST
ON OVERNIGHT WEDNESDAY INTO THURSDAY.  RAIN AND HIGHER ELEVATION
SNOW WILL DEVELOP OVER CENTRAL/NORTHERN CALIFORNIA BY WEDNESDAY
EVENING.  THE SNOW WILL EXPAND EASTWARD INTO PARTS OF THE GREAT
BASIN/NORTHERN INTERMOUNTAIN REGION BY THURSDAY EVENING.  RAIN AND
HIGHER ELEVATION SNOW WILL MOVE INTO PARTS OF THE PACIFIC
NORTHWEST EARLY THURSDAY MORNING EXPANDING NORTHWARD INTO
WASHINGTON STATE ON THURSDAY AFTERNOON INTO EVENING.
ADDITIONALLY, RAIN AND FREEZING RAIN WILL DEVELOP OVER INTERIOR
PARTS OF NORTHERN CALIFORNIA/PACIFIC NORTHWEST ON THURSDAY MORNING
INTO EVENING.


ZIEGENFELDER


GRAPHICS AVAILABLE AT WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_WBG.PHP
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