Prognostic Meteorological Discussion
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FXUS01 KWBC 030822
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
322 AM EST SAT DEC 03 2016

VALID 12Z SAT DEC 03 2016 - 12Z MON DEC 05 2016

...HEAVY RAIN POSSIBLE ACROSS PORTIONS OF THE WESTERN GULF COAST
TO THE SOUTHEAST...

...SNOW FOR THE CASCADES AND NORTHERN ROCKIES...

A DEEP UPPER-LEVEL LOW OVER NORTHWESTERN MEXICO WILL MOVE EASTWARD
TO NORTH-CENTRAL MEXICO BY MONDAY.  THE CIRCULATION AROUND THE
UPPER LOW WILL AID IN STREAMING MOISTURE OFF THE GULF OF MEXICO
INTO THE GULF COAST STATES THAT WILL PRODUCE SHOWERS AND
THUNDERSTORMS OVER THE WESTERN GULF COAST THAT WILL EXPAND
EASTWARD TO THE EASTERN GULF COAST BY SUNDAY EVENING.  RAIN WILL
ALSO DEVELOP OVER PARTS OF THE SOUTHERN PLAINS INTO THE LOWER
MISSISSIPPI VALLEY THAT WILL EXPAND INTO PARTS OF THE TENNESSEE
VALLEY BY SATURDAY EVENING AND MOVE INTO PARTS OF THE OHIO VALLEY
AND THE CENTRAL/SOUTHERN APPALACHIANS/SOUTHEAST BY SUNDAY EVENING.
 THE RAIN WILL BE HEAVY AT TIMES.  SNOW WILL DEVELOP OVER PARTS OF
THE SOUTHERN ROCKIES INTO PARTS OF THE CENTRAL HIGH PLAINS BY
SATURDAY MORNING THAT WILL WIND DOWN OVER THE SOUTHERN ROCKIES BY
SATURDAY EVENING.  IN ADDITION, RAIN WILL DEVELOP OVER PARTS OF
THE SOUTHWEST AND SOUTHERN ROCKIES THROUGH SATURDAY EVENING.

MEANWHILE, UPPER-LEVEL ENERGY OVER THE NORTHERN PLAINS INTO THE
CENTRAL ROCKIES WILL MOVE EASTWARD TO THE UPPER MISSISSIPPI
VALLEY/UPPER GREAT LAKES AND PARTS OF THE OHIO VALLEY BY SUNDAY
EVENING.  THE SYSTEM WILL PRODUCE RAIN AND SNOW OVER PARTS OF THE
CENTRAL PLAINS/MIDDLE MISSISSIPPI VALLEY BY SATURDAY EVENING THAT
WILL BECOME MOSTLY SNOW OVER THE UPPER MISSISSIPPI VALLEY/UPPER
GREAT LAKES BY SUNDAY EVENING.  MOSTLY RAIN WILL MOVE INTO THE
OHIO VALLEY BY SUNDAY EVENING, TOO.

ONSHORE FLOW WILL AID IN PRODUCING RAIN AND HIGHER ELEVATION SNOW
OVER PARTS OF THE PACIFIC NORTHWEST THAT WILL BEGIN TO MOVE INTO
NORTHERN CALIFORNIA ON SUNDAY PRODUCING RAIN OVER PARTS OF
NORTHERN CALIFORNIA SUNDAY AFTERNOON INTO EVENING.  FURTHERMORE,
SOME OF THE MOISTURE FROM THE PACIFIC WILL MOVE INLAND TO THE
NORTHERN INTERMOUNTAIN REGION/NORTHERN ROCKIES THAT WILL PRODUCE
SNOW OVER THE AREA THROUGH SUNDAY MORNING.  A FRONT WILL MOVE
ONSHORE OVER THE PACIFIC NORTHWEST ON SATURDAY EVENING AND MOVE
INLAND TO THE NORTHERN ROCKIES/NORTHERN HIGH PLAINS BY SUNDAY
EVENING.  THE BOUNDARY WILL AID IN PRODUCING RAIN AND HIGHER
ELEVATION SNOW OVER PARTS OF THE PACIFIC NORTHWEST ON SATURDAY
EVENING WITH SNOW DEVELOPING OVER PARTS OF THE NORTHERN ROCKIES BY
SUNDAY MORNING.  THE SNOW WILL CONTINUE OVER THE NORTHERN ROCKIES
AND MOVE INTO PARTS OF THE NORTHERN HIGH PLAINS BY SUNDAY EVENING.


ELSEWHERE, UPPER-LEVEL ENERGY OVER THE GREAT LAKES INTO THE
NORTHEAST WILL AID IN PRODUCING LAKE EFFECT SNOW DOWNWIND FROM THE
GREAT LAKES ON SATURDAY THAT WILL WIND DOWN, WEST TO EAST,
OVERNIGHT SATURDAY INTO SUNDAY MORNING.


ZIEGENFELDER


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