Prognostic Meteorological Discussion
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000
FXUS01 KWBC 071940
PMDSPD

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

VALID 00Z THU DEC 08 2016 - 00Z SAT DEC 10 2016

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

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

...A MIX OF RAIN, FREEZING RAIN AND SNOW POSSIBLE OVER INTERIOR
PORTIONS OF THE PACIFIC NORTHWEST AND NORTHERN CALIFORNIA...

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

MUCH OF THE UPPER MIDWEST, GREAT LAKES AND NORTHEAST WILL LIKELY
HAVE SNOW OVER THE NEXT FEW DAYS. A DEEP LOW PRESSURE CENTER,
ASSOCIATED WITH A COLD FRONT TRACKING EAST OVER THE ATLANTIC
OCEAN, WILL SLOWLY LIFT NORTH OF THE GREAT LAKES REACHING
NEWFOUNDLAND AND LABRADOR BY FRIDAY. STRONGER WINDS ON THE
BACKSIDE OF THE LOW WILL BE ORIENTED WHERE THE LAKES WILL ENHANCE
THE SNOW AMOUNTS. FAVORED AREAS DOWNWIND OF THE GREAT LAKES WILL
HAVE LAKE EFFECT SNOW
HIGHER ELEVATION SNOW AND RAIN WILL DEVELOP OVER PARTS OF THE
CENTRAL APPALACHIANS/LOWER GREAT LAKES EASTWARD TO THE
NORTHEAST/NORTHERN MID-ATLANTIC DURING THE OVERNIGHT HOURS AND
WILL SLOWLY WIND DOWN FROM WEST TO EAST BY FRIDAY MORNING.

COLD AIR POOLED AGAINST THE ROCKIES WILL SURGE SOUTHWARD INTO THE
SOUTHERN ROCKIES AND SOUTHERN PLAINS THIS AFTERNOON AND EVENING.
BUILDING HIGH PRESSURE OVER THE NORTHERN AND CENTRAL HIGH PLAINS
WILL KEEP A MUCH COLDER AIRMASS IN PLACE, RESULTING IN NUMEROUS
LOCATIONS WITH TEMPERATURES 15 TO 35 DEGREES COLDER THAN AVERAGE
FOR THE REST OF THIS WEEK. A PLUME OF MOISTURE STREAMING IN FROM
THE PACIFIC WILL PASS THROUGH THE PACIFIC NORTHWEST, PORTIONS OF
THE GREAT BASIN AND THE INTERMOUNTAIN REGION WILL INTERACT WITH A
SYSTEM PUSHING INLAND FROM THE PACIFIC OCEAN. COASTAL AREAS WILL
HAVE RAIN; HOWEVER IT WILL QUICKLY TRANSITION TO A WINTRY MIX OVER
THE INTERIOR AND SNOW IN THE MOUNTAINS.

A BOUNDARY MOVING OVER SOUTHERN FLORIDA WILL AID IN PRODUCING
SHOWERS AND THUNDERSTORMS OVER THE REGION OVER THE NEXT COUPLE OF
DAYS.

CAMPBELL


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