Preliminary Forecasts
Issued by NWS

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FXUS02 KWNH 260353
PREEPD

PRELIMINARY EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
1052 PM EST THU DEC 25 2014

VALID 12Z MON DEC 29 2014 - 12Z FRI JAN 02 2015


...ARCTIC AIR TO SPLIT ASTRIDE THE ROCKIES...

THE GLOBAL NUMERICAL GUIDANCE HAS CONVERGED ON A COLDER, DRIER
PATTERN FOR THE CONTIGUOUS UNITED STATES AT THE MEDIUM RANGE. A
SPRAWLING ARCTIC HIGH IS PROGGED TO SPLIT NEARLY EVENLY ALONG THE
NORTHERN CONTINENTAL DIVIDE EARLY NEXT WEEK, WITH A SIZABLE CHUNK
OF COLD, DRY AIR SPREADING DEEP INTO THE GREAT BASIN AND SPILLING
WESTWARD ACROSS THE SIERRA NEVADA. THE NEGATIVE THERMAL ANOMALIES
WILL FOLLOW THE SURFACE HIGH SOUTHWARD, WITH A FAIRLY IMPRESSIVE
REBOUND ANTICIPATED OVER THE NORTHERN PLAINS BY MIDWEEK. UPSLOPE
SNOWS ARE EXPECTED TO TRACK DOWN THE HIGH PLAINS TUESDAY AND
WEDNESDAY, WITH MUCH OF WESTERN TEXAS EXPERIENCING WINTRY
CONDITIONS WEDNESDAY INTO THURSDAY. THE EAST WILL GRADUALLY COOL
DOWN AND DRY OUT, WITH THE SOUTHEAST THE ONE HOLDOUT FOR TRUE
COLD. USED A BLEND OF GMOS, THE ECENS MEAN, AND THE NAEFS MEAN FOR
TEMPERATURES INTO WEDNESDAY, DROPPING MOS THEREAFTER IN LIGHT OF
ITS FUNDAMENTALLY DIFFERENT PATTERN OVER THE CENTRAL STATES FROM
THE CANADIAN BORDER TO MEXICO.


CISCO

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