Prognostic Meteorological Discussion
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FXUS01 KWBC 182019
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
318 PM EST WED JAN 18 2017

VALID 00Z THU JAN 19 2017 - 00Z SAT JAN 21 2017

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

...HEAVY RAIN POSSIBLE OVER MOST OF THE WEST COAST...

...HEAVY RAIN POSSIBLE OVER THE LOWER MISSISSIPPI VALLEY INTO THE
TENNESSEE VALLEY...

...SNOW POSSIBLE OVER PARTS OF NORTHERN NEW ENGLAND...

LOW PRESSURE DEVELOPING OVER EASTERN TEXAS/LOWER MISSISSIPPI
VALLEY WILL LIFT NORTHWARD TO THE WESTERN OHIO VALLEY BY FRIDAY.
THE SYSTEM WILL PRODUCE SHOWERS AND THUNDERSTORMS OVER PARTS OF
THE WESTERN GULF COAST AND THE LOWER MISSISSIPPI VALLEY THAT WILL
MOVE EASTWARD TO PARTS OF THE SOUTHEAST BY THURSDAY EVENING INTO
FRIDAY.  DURING THE DAY ON THURSDAY, THE SHOWERS AND THUNDERSTORMS
WILL EXTEND AS FAR NORTH AS THE WESTERN OHIO VALLEY THROUGH LATE
THURSDAY NIGHT.  RAIN WILL DEVELOP ALONG THE BOUNDARY OVER PARTS
OF THE MIDDLE MISSISSIPPI VALLEY BY THURSDAY MORNING THAT WILL
MOVE INTO PARTS OF THE UPPER MISSISSIPPI VALLEY, GREAT LAKES, AND
OHIO VALLEY BY FRIDAY MORNING.  IN ADDITION, UPPER-LEVEL ENERGY
WILL MOVE OVER NORTHERN NEW ENGLAND OVERNIGHT WEDNESDAY PRODUCE
RAIN AND HIGHER ELEVATION SNOW OVER PARTS OF THE NORTHEAST THROUGH
THURSDAY EVENING.

MEANWHILE, A DEEP UPPER-LEVEL TROUGH JUST OFF THE WEST COAST WILL
MOVE INLAND TO THE ROCKIES BY FRIDAY.  A PLUME OF MOISTURE WILL
STREAM INTO PARTS OF CENTRAL/NORTHERN CALIFORNIA THAT WILL MOVE
SOUTHWARD TO SOUTHERN CALIFORNIA BY THURSDAY AFTERNOON.  ONSHORE
FLOW WILL CONTINUE TO MOVE INTO CALIFORNIA THURSDAY INTO FRIDAY.
THE STORM WILL PRODUCE RAIN AND HIGHER ELEVATION SNOW OVER
CALIFORNIA INTO THE PACIFIC NORTHWEST AS WELL AS PARTS OF THE
GREAT BASIN AND THE NORTHERN ROCKIES.  RAIN AND SNOW WILL MOVE
INTO PARTS OF THE GREAT BASIN/SOUTHWEST ON THURSDAY MOVING
EASTWARD TO THE ROCKIES OVERNIGHT THURSDAY INTO FRIDAY.  AS THE
UPPER-LEVEL TROUGH MOVES INLAND, SNOW LEVELS WILL DROP DOWN TO
5,000 FT OVER THE SOUTHWESTERN CALIFORNIA MOUNTAINS.  SOME OF THE
SNOW AND RAIN WILL BE HEAVY AT TIMES OVER THE WEST COAST.


ZIEGENFELDER


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