Prognostic Meteorological Discussion
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FXUS01 KWBC 222027
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
327 PM EST WED NOV 22 2017

VALID 00Z THU NOV 23 2017 - 00Z SAT NOV 25 2017

...HEAVY RAIN POSSIBLE OVER THE PACIFIC NORTHWEST...

...HEAVY RAIN POSSIBLE OVER NORTHERN FLORIDA PENINSULA...

A WAVE OF LOW PRESSURE ALONG A FRONT OVER THE EASTERN GULF OF
MEXICO WILL MOVE NORTHEASTWARD ACROSS THE FLORIDA PENINSULA
OVERNIGHT THURSDAY (THANKSGIVING) INTO THE WESTERN ATLANTIC WELL
OFF THE SOUTHERN CAROLINA/GEORGIA COAST BY FRIDAY.  MOISTURE WILL
POOL ALONG THE BOUNDARY AIDING IN THE DEVELOPMENT OF SHOWERS AND
THUNDERSTORMS OVER THE FLORIDA PENINSULA OVERNIGHT WEDNESDAY INTO
FRIDAY MORNING.  RAIN WILL BE HEAVY AT TIMES.

MEANWHILE, A FRONT JUST OFF THE PACIFIC NORTHWEST COAST WILL MOVE
INLAND ON THANKSGIVING CONTINUING TO MOVE EASTWARD TO UPPER
MISSISSIPPI VALLEY/NORTHERN PLAINS WESTWARD INTO THE CENTRAL HIGH
PLAINS/NORTHERN ROCKIES BY FRIDAY.  A PLUME OF MOISTURE ALONG THE
NORTHWEST COAST WILL MOVE SOUTHWARD TO CENTRAL CALIFORNIA BY
FRIDAY.  RAIN WILL DEVELOP ALONG THE PACIFIC NORTHWEST COAST AND
PARTS OF THE NORTHERN CALIFORNIA COAST THAT WILL EXTEND INLAND TO
PARTS OF THE NORTHERN ROCKIES WEDNESDAY EVENING INTO THURSDAY.
OVERNIGHT WEDNESDAY THE SNOW LEVELS WILL START TO LOWER AS THE
FRONT MOVES BY.  RAIN AND HIGHEST ELEVATION SNOW WILL DEVELOP OVER
PARTS THE NORTHERN INTERMOUNTAIN REGION INTO THE NORTHERN HIGH
PLAINS OVERNIGHT THURSDAY INTO FRIDAY.  RAIN WILL CONTINUE OVER
NORTHERN CALIFORNIA INTO OREGON THURSDAY INTO FRIDAY MORNING.
ADDITIONALLY, ONSHORE FLOW OVER THE PACIFIC NORTHWEST WILL PRODUCE
RAIN OVER THE WASHINGTON STATE COAST AND SNOW DEVELOPING OVER
PARTS OF THE CASCADES THURSDAY INTO FRIDAY.

IN ADDITION, AN AREA OF LOW PRESSURE OVER THE NORTHERN PLAINS WILL
MOVE EASTWARD TO THE SOUTHWESTERN WISCONSIN AND DISSIPATE BY
THURSDAY MORNING, THANKSGIVING.  AN AREA OF LIGHT SNOW WILL
DEVELOP OVER THE PARTS OF THE UPPER MISSISSIPPI VALLEY ON
WEDNESDAY EVENING, DISSIPATING BY THURSDAY MORNING, THANKSGIVING.
FURTHERMORE, AN AREA OF LOW PRESSURE EAST OF THE GULF OF MAINE
WILL MOVE NORTHWARD INTO SOUTHEASTERN CANADA BY THURSDAY MORNING.
THE LOW WILL AID IN DEVELOPING RAIN AND SNOW OVER PARTS OF NEW
ENGLAND ENDING BY THURSDAY MORNING, THANKSGIVING.


ZIEGENFELDER


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





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