Prognostic Meteorological Discussion
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000
FXUS01 KWBC 172015
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
314 PM EST WED JAN 17 2018

VALID 00Z THU JAN 18 2018 - 00Z SAT JAN 20 2018

...HEAVY RAIN POSSIBLE FOR PARTS OF THE PACIFIC NORTHWEST/NORTHERN
CALIFORNIA...

...HEAVY SNOW POSSIBLE FOR PARTS OF THE CASCADES AND THE SIERRAS...

...SNOW POSSIBLE FOR THE NORTHERN ROCKIES...

A DEEP UPPER-LEVEL TROUGH OVER THE MID-ATLANTIC WILL MOVE EASTWARD
OUT OVER THE WESTERN ATLANTIC BY THURSDAY EVENING.  THE SYSTEM
WILL PRODUCE LIGHT SNOW OVER PARTS OF THE SOUTHERN MID-ATLANTIC
INTO THE CAROLINAS THAT WILL BEGIN TO SLOWLY END OVER THE AREA
OVERNIGHT WEDNESDAY INTO THURSDAY MORNING.  ANOTHER AREA OF SNOW
OVER THE NORTHEAST WILL ALSO END OVERNIGHT ON WEDNESDAY.
ADDITIONALLY, ANOTHER AREA OF UPPER-LEVEL ENERGY OVER
SOUTH-CENTRAL CANADA WILL MOVE SOUTHEASTWARD OVER THE GREAT LAKES
TO NEW ENGLAND COAST BY FRIDAY.  THE ENERGY WILL PRODUCE LIGHT
SNOW OVER A SMALL PART OF THE UPPER MISSISSIPPI VALLEY ON THURSDAY
MORNING ENDING THURSDAY AFTERNOON.  THE ENERGY WILL ALSO TRIGGER
LIGHT SNOW OVER PARTS OF THE NORTHEAST LATE THURSDAY NIGHT INTO
FRIDAY.

MEANWHILE, A FRONT MOVING ONSHORE OVER THE PACIFIC
NORTHWEST/NORTHERN CALIFORNIA WILL SLOWLY MOVE INLAND TO PARTS OF
THE NORTHERN PLAINS TO THE GREAT BASIN AND SOUTHERN CALIFORNIA BY
FRIDAY.  MOISTURE WILL FLOW INTO THE NORTHWEST AND NORTHERN
CALIFORNIA THAT WILL MOVE SOUTHWARD TO SOUTHERN CALIFORNIA BY
FRIDAY.  RAIN WILL DEVELOP OVER THE PACIFIC NORTHWEST COAST ON
WEDNESDAY EVENING THAT WILL EXPAND INLAND TO THE NORTHERN
INTERMOUNTAIN REGION/NORTHERN CALIFORNIA BY THURSDAY AFTERNOON
WITH SNOW OVER THE HIGHER ELEVATIONS OF THE CASCADES INTO THE
NORTHERN ROCKIES.  OVERNIGHT THURSDAY, SNOW WILL DEVELOP OVER THE
SIERRAS INTO PARTS OF THE GREAT BASIN NORTHEASTWARD INTO THE
NORTHERN HIGH PLAINS BY FRIDAY.  IN ADDITION, THE RAIN WILL MOVE
INTO CENTRAL CALIFORNIA ON THURSDAY THAT WILL BEGIN TO MOVE INTO
SOUTHERN CALIFORNIA BY FRIDAY.  IN THE WAKE OF THE FRONT, ONSHORE
FLOW OVER THE NORTHWEST WILL AID IN THE DEVELOPMENT OF COASTAL
RAIN AND HIGHER ELEVATION SNOW OVER THE REGION THURSDAY AFTERNOON
INTO FRIDAY.

ELSEWHERE, UPPER-LEVEL ENERGY OVER NORTH-CENTRAL MEXICO WILL MOVE
EASTWARD TO THE WESTERN GULF COAST BY FRIDAY MORNING.  AS THE
SYSTEM MOVES EASTWARD, MOISTURE FROM THE WESTERN GULF OF MEXICO
WILL BEGIN TO STREAM NORTHWARD OVER THE WESTERN GULF COAST AND THE
SOUTHERN PLAINS OVERNIGHT WEDNESDAY.  THE ENERGY AND MOISTURE WILL
START TO PRODUCE LIGHT RAIN OVER PARTS OF THE WESTERN GULF COAST
THURSDAY AFTERNOON INTO FRIDAY.


ZIEGENFELDER


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




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