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633
FXUS02 KWNH 210454
PREEPD

PRELIMINARY EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
1153 PM EST THU NOV 20 2014

VALID 12Z MON NOV 24 2014 - 12Z FRI NOV 28 2014


USED THE 12Z/20 EUROPEAN CENTRE ENSEMBLE MEAN AS A SYNOPTIC BASE
FOR THIS FORECAST PERIOD. THAT VERSION OF THE ECENS MEAN WAS
MARKED BY QUITE A BIT MORE NORTHERN STREAM DOMINANCE THAN THE
00Z/20 VERSION--AS WELL AS THE 00Z/20 AND 12Z/20 OPERATIONAL ECMWF
MODELS. THE DELIVERY OF CONTINENTAL POLAR AND ARCTIC AIR INTO THE
CONTIGUOUS UNITED STATES HAS CERTAINLY RELENTED AT TIMES DURING
THE LAST COUPLE WEEKS; BUT, BY AND LARGE, THE COLD AIR SEEMS TO BE
DIGGING IN ITS HEELS. INDEED, THE 00Z/21 OPERATIONAL GFS SHARES
MANY ASPECTS IN COMMON WITH THE ECENS MEAN FROM THE PREVIOUS MAJOR
DATA CYCLE. WITH COLD AIR SPREAD ACROSS SO MUCH OF THE NATION EAST
OF THE ROCKIES, WILL NEED TO WATCH THE SOUTHERN STREAM FOR WAVE
DEVELOPMENT THAT COULD LEAD TO SIGNIFICANT SNOW AND ICE.


CISCO

$$






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