Prognostic Meteorological Discussion
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000
FXUS01 KWBC 142018
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
318 PM EST THU DEC 14 2017

VALID 00Z FRI DEC 15 2017 - 00Z SUN DEC 17 2017

...HEAVY LAKE EFFECT/LAKE ENHANCES SNOW POSSIBLE DOWNWIND FROM THE
GREAT LAKES...

...HEAVY SNOW POSSIBLE OVER PARTS OF THE CASCADES AND THE NORTHERN
ROCKIES...

...HEAVY RAIN POSSIBLE OVER PARTS OF SOUTHERN TEXAS...

A REGION OF STRONG UPPER-LEVEL ENERGY OVER WESTERN ONTARIO/UPPER
MISSISSIPPI VALLEY WILL MOVE ACROSS THE GREAT LAKES TO OFF THE
NORTHEAST COAST BY SATURDAY.  LAKE EFFECT/LAKE ENHANCES SNOW WILL
DEVELOP OVER THE GREAT LAKES THROUGH SATURDAY WITH SNOW HEAVY AT
TIMES.  THE ASSOCIATED FRONT WILL ALSO AID IN PRODUCING SNOW OVER
PARTS OF THE NORTHEAST AND UPPER MISSISSIPPI VALLEY/NORTHERN
PLAINS ALSO THROUGH SATURDAY.  IN ADDITION, UPPER-LEVEL ENERGY
OVER THE OVER THE CENTRAL PLAINS WILL MOVE TO THE LOWER
MISSISSIPPI AND TENNESSEE VALLEYS BY FRIDAY MORNING.  THE ENERGY
WILL TRIGGER LIGHT SNOW OVER PARTS OF THE NORTHERN/CENTRAL PLAINS
THAT WILL END BY LATE EVENING ON THURSDAY.

MEANWHILE, ONSHORE FLOW DEVELOPS OVER PARTS OF THE PACIFIC
NORTHWEST OVERNIGHT THURSDAY INTO SATURDAY.  THE FLOW WILL AID IN
PRODUCING COASTAL RAIN AND HIGHER ELEVATION SNOW OVER THE PACIFIC
NORTHWEST THROUGH SATURDAY.  ADDITIONALLY, UPPER-LEVEL ENERGY AND
ASSOCIATED UPPER-LEVEL TROUGH WILL MOVE ONSHORE OVER THE NORTHWEST
ON FRIDAY EVENING THAT WILL MOVE SOUTHEASTWARD TO THE NORTHERN
INTERMOUNTAIN REGION TO CENTRAL CALIFORNIA BY SATURDAY MORNING.
THE ENERGY WILL AID IN PRODUCING SNOW OVER PARTS OF THE NORTHERN
INTERMOUNTAIN REGION/NORTHERN ROCKIES INTO PARTS OF THE GREAT
BASIN FRIDAY EVENING INTO SATURDAY.  ELSEWHERE, A FRONT OVER THE
GULF OF MEXICO WILL STALL WHILE A WAVE OF LOW PRESSURE WILL MOVE
WESTWARD TO THE MEXICAN COAST ON FRIDAY INTO SATURDAY.  RAIN WILL
DEVELOP OVER PARTS THE SOUTHERN TIP OF TEXAS OVERNIGHT THURSDAY
INTO SATURDAY MORNING.


ZIEGENFELDER


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