333
FXUS01 KWBC 050834
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
333 AM EST THU NOV 05 2009
VALID 12Z THU NOV 05 2009 - 00Z SAT NOV 07 2009
AS TWO UPPER LEVEL WAVES OF ENERGY BEGIN TO MERGE OVER THE
NORTHEAST TODAY... RAPID DEVELOPMENT OF A SURFACE LOW IN THE
WESTERN ATLANTIC SHOULD TAKE PLACE. THE SURFACE ANALYSIS ALREADY
SHOWS A LOW AND DEVELOPING FRONT ALONG THE MID ATLANTIC COAST...
AND THIS LOW IS FORECAST TO TRACK NORTHEASTWARD TODAY AS A RENEWED
SURGE OF COLD AIR SWEEPS IN FROM CANADA. THE PLACEMENT OF THE LOW
IS EXPECTED TO BE FAR ENOUGH EAST TO PREVENT ANY SIGNIFICANT
EFFECTS IN THE NORTHEAST HOWEVER... OTHER THAN SOME LIGHT RAIN AND
SNOW IN THE HIGHER TERRAIN OF THE NORTHEAST AND NORTHERN MID
ATLANTIC WITH THE UPPER LEVEL DISTURBANCES MOVING THROUGH AND LAKE
EFFECT SNOW TONIGHT INTO FRIDAY MORNING. GUSTY WINDS ARE ALSO
LIKELY ALONG THE NEW ENGLAND COAST... ESPECIALLY BY FRIDAY MORNING
AS THE LOW DEEPENS. THE LOW SHOULD QUICKLY DEPART AWAY FROM THE
REGION WITH HIGH PRESSURE BUILDING EASTWARD FROM THE CENTRAL U.S.
ON FRIDAY.
THAT HIGH WILL BUILD EASTWARD AS AN UPPER LEVEL RIDGE MOVES EAST
FROM THE ROCKIES THIS MORNING... FOLLOWED BY A DEEP TROUGH TO MOVE
INTO THE WEST LATER TODAY. SOUTHERLY FLOW WILL INCREASE OVER THE
PLAINS TODAY LEADING TO A WARM NOVEMBER DAY TODAY AND FRIDAY FOR A
GOOD DEAL OF THE ROCKIES AND GREAT PLAINS WITH HIGH TEMPERATURES
EXPECTED TO BE WELL INTO THE 70S BOTH DAYS OVER THE HIGH PLAINS.
THE ONLY SIGNIFICANT... WIDESPREAD PRECIPITATION WILL BE ACROSS
THE NORTHWEST AS THE AFOREMENTIONED UPPER LEVEL TROUGH AND
ASSOCIATED STRONG COLD FRONT MOVE INTO THE REGION. THIS COLD FRONT
IS EXPECTED TO MAKE LANDFALL ACROSS THE PACIFIC NORTHWEST TONIGHT
WITH WIDESPREAD RAIN... CHANGING TO SNOW FOR THE CASCADES AS THE
FRONT MOVES THROUGH. A PERSISTENT ONSHORE FLOW WILL KEEP
PRECIPITATION IN THE FORECAST FOR THE NORTHWEST WELL INTO THE
WEEKEND. LOCALLY HEAVY PRECIPITATION CAN BE EXPECTED IN REGIONS OF
WEST FACING TERRAIN THROUGHOUT WESTERN WASHINGTON AND OREGON INTO
SATURDAY.
OTTO
GRAPHIC AVAILABLE AT WWW.HPC.NCEP.NOAA.GOV
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