Prognostic Meteorological Discussion
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FXUS01 KWBC 152030
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
329 PM EST FRI DEC 15 2017

VALID 00Z SAT DEC 16 2017 - 00Z MON DEC 18 2017

...HEAVY SNOW POSSIBLE OVER THE NORTHERN CASCADES...

...HEAVY LAKE EFFECT SNOW POSSIBLE DOWNWIND FROM LAKES ERIE AND
ONTARIO...

...SNOW POSSIBLE OVER THE NORTHERN ROCKIES AND PARTS OF SOUTHERN
NEW ENGLAND COAST...

UPPER-LEVEL ENERGY OVER PENSILVANIA WILL MOVE EASTWARD OUT OVER
THE WESTERN ATLANTIC BY SATURDAY MORNING.  THE ENERGY WILL AID IN
PRODUCING LIGHT SNOW OVER PARTS OF THE NORTHERN MID-ATLANTIC COAST
AND SOUTHERN NEW ENGLAND COAST THAT WILL END OVERNIGHT FRIDAY.  IN
ADDITION, ANOTHER AREA OF UPPER-LEVEL ENERGY OVER LAKES SUPERIOR
WILL, LIKEWISE, MOVE EASTWARD OUT OVER THE WESTERN ATLANTIC BY
SATURDAY EVENING.  THE ENERGY WILL AID IN PRODUCING LAKE EFFECT
SNOW DOWNWIND FROM THE GREAT LAKES ENDING BY SATURDAY EVENING.
ADDITIONALLY, A FRONT OVER THE NORTHERN PLAINS INTO THE UPPER
GREAT LAKES WILL ALSO AID IN DEVELOPING LIGHT SNOW NEAR THE
BOUNDARY THAT WILL LIFT NORTHWARD INTO WESTERN ONTARIO BY LATE
SATURDAY EVENING.

MEANWHILE, A STRONG UPPER-LEVEL TROUGH MOVING ONSHORE OVER THE
WEST COAST WILL MOVE SOUTHEASTWARD TO THE NORTHERN
ROCKIES/SOUTHWEST BY SUNDAY.  THE ENERGY WILL AID IN PRODUCING
COASTAL RAIN AND HIGHER ELEVATION SNOW OVER THE PACIFIC NORTHWEST
THROUGH SATURDAY MORNING.  OVERNIGHT FRIDAY, SNOW WILL DEVELOP
OVER PARTS OF THE NORTHERN INTERMOUNTAIN REGION/NORTHERN ROCKIES
EXPANDING INTO THE GREAT BASIN AND STREAMING OUT INTO PARTS OF THE
NORTHERN/CENTRAL PLAINS ON SATURDAY.  THE SNOW WILL BEGIN TO WANE
ON SUNDAY MORNING OVER THE AREA.  A FRONT WILL APPROACH THE
PACIFIC NORTHWEST SATURDAY AFTERNOON INTO SUNDAY THAT WILL AID IN
PRODUCING COASTAL RAIN AND HIGHER ELEVATION SNOW ON SATURDAY
AFTERNOON INTO SUNDAY.

FURTHERMORE, AS THE UPPER-LEVEL ENERGY MOVES INTO THE SOUTHWEST ON
SATURDAY NIGHT INTO SUNDAY.  MOISTURE FROM THE PACIFIC WILL MOVE
INTO THE SOUTHWEST THAT WILL AID IN PRODUCING HIGHER ELEVATION
SNOW AND LOWER ELEVATION RAIN OVERNIGHT SATURDAY INTO SUNDAY.
ELSEWHERE, AN UPPER-LEVEL LOW OVER WEST-CENTRAL MEXICAN COAST WILL
WEAKEN AND MOVE NORTHEASTWARD INTO THE SOUTHERN PLAINS/LOWER
MISSISSIPPI VALLEY BY SUNDAY.  MOISTURE FROM THE WESTERN GULF OF
MEXICO WILL START TO FLOW NORTHWARD OVER THE WESTERN GULF COAST BY
EARLY SATURDAY MORNING THAT WILL STRENGTHEN MOVING INTO THE
LOWER/MIDDLE MISSISSIPPI VALLEY AND THE TENNESSEE VALLEY BY
SUNDAY.  RAIN WILL DEVELOP OVER PARTS OF THE WESTERN/CENTRAL GULF
COAST BY FRIDAY EVENING THAT WILL MOSTLY COME TO AN END OVERNIGHT
FRIDAY.  ON SATURDAY AS THE MOISTURE MOVES OVER THE SOUTHERN
PLAINS, RAIN WILL DEVELOP OVER SOUTHERN TEXAS THAT WILL EXPAND AND
MOVE NORTHEASTWARD INTO THE LOWER MISSISSIPPI VALLEY OVERNIGHT
SATURDAY INTO SUNDAY.


ZIEGENFELDER


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





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