Prognostic Meteorological Discussion
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055
FXUS01 KWBC 202031
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
330 PM EST MON NOV 20 2017

VALID 00Z TUE NOV 21 2017 - 00Z THU NOV 23 2017

...HEAVY RAIN POSSIBLE FOR THE PACIFIC NORTHWEST...

...LIGHT LAKE EFFECT SNOW DOWNWIND OF THE GREAT LAKES...

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

A FRONT EXTENDING FROM THE UPPER MISSISSIPPI VALLEY/NORTHERN
PLAINS NORTHWESTWARD INTO THE NORTHERN HIGH PLAINS WILL MOVE SOUTH
AND EASTWARD TO OFF THE EASTERN SEABOARD AND OFF THE GULF COAST
STATES BY WEDNESDAY.  LIGHT SNOW WILL DEVELOP OVER PARTS OF THE
UPPER GREAT LAKES OVERNIGHT MONDAY THAT WILL BECOME RAIN AND SNOW
OVER THE LOWER GREAT LAKES/OHIO VALLEY BY TUESDAY EVENING.  THE
RAIN AND LIGHT SNOW WILL MOVE TO THE NORTHEAST OVERNIGHT TUESDAY
INTO WEDNESDAY.

MEANWHILE, UPPER-LEVEL ENERGY OVER THE PACIFIC NORTHWEST WILL MOVE
SOUTHEASTWARD TO THE WESTERN GULF COAST WHILE WEAKENING.  THE
ENERGY WILL AID IN DEVELOPING RAIN AND HIGHER ELEVATION SNOW OVER
PARTS OF PACIFIC NORTHWEST INTO THE NORTHERN ROCKIES THAT WILL
MOVE SOUTHEASTWARD TO THE CENTRAL ROCKIES/CENTRAL PLAINS AND
DISSIPATE BY TUESDAY EVENING.  IN ADDITION, ANOTHER AREA OF
UPPER-LEVEL ENERGY OVER THE WESTERN GULF COAST WILL MOVE EASTWARD
TO THE SOUTHEAST BY TUESDAY EVENING THEN MOVE NORTHEASTWARD OUT
OVER THE WESTERN ATLANTIC BY WEDNESDAY AIDING IN THE DEVELOPMENT
OF AN AREA OF LOW PRESSURE OFF THE NORTH CAROLINA COAST OVERNIGHT
TUESDAY INTO WEDNESDAY.  SHOWERS AND THUNDERSTORMS WILL DEVELOP
OVER PARTS OF THE SOUTHEAST/FLORIDA ON TUESDAY INTO TUESDAY
AFTERNOON.   ON TUESDAY AFTERNOON, RAIN AND THUNDERSTORMS WILL
MOVE NORTHWARD ALONG THE SOUTHEAST COAST INTO THE SOUTHERN
MID-ATLANTIC OVERNIGHT TUESDAY INTO WEDNESDAY.  RAIN WILL MOVE
INTO PARTS OF THE NORTHERN MID-ATLANTIC COAST ON WEDNESDAY.

ADDITIONALLY, A PLUME OF MOISTURE STREAMING INTO CENTRAL
CALIFORNIA WILL MOVE NORTHWARD PARALLELING THE COAST INTO THE
NORTHWEST MONDAY NIGHT INTO WEDNESDAY.  RAIN WILL DEVELOP OVER
PARTS OF NORTHERN CALIFORNIA ON MONDAY EVENING MOVING INTO THE
NORTHWEST OVERNIGHT MONDAY INTO TUESDAY.  THE RAIN WILL MOVE
INLAND OVER THE PACIFIC NORTHWEST EXPANDING INTO THE NORTHERN
INTERMOUNTAIN REGION/NORTHERN ROCKIES TUESDAY AFTERNOON INTO
WEDNESDAY.  OVERNIGHT MONDAY INTO TUESDAY THE SNOW LEVEL RISES
OVER THE NORTHWEST INTO THE NORTHERN ROCKIES, LIMITING THE AMOUNT
OF PRECIPITATION THAT WILL FALL AS SNOW.


ZIEGENFELDER


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





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