Prognostic Meteorological Discussion
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FXAK02 KWNH 221829
PMDAK

ALASKA EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
129 PM EST MON DEC 22 2014

VALID 12Z FRI DEC 26 2014 - 12Z TUE DEC 30 2014


LOTS OF ENERGY CROSSING THE NORTHEASTERN PACIFIC OCEAN AT THE
MEDIUM RANGE--AND LOTS OF DIFFERENT MODEL SOLUTIONS. STILL FIND
THAT PEPPERING IN SOME DETAILS FROM RECENT OPERATIONAL ECMWF RUNS
ONTO THE BASE OF THE ECENS MEAN SEEMS TO PRESERVE THE INTEGRITY OF
THE GRADIENTS OF THE INDIVIDUAL CYCLONES, WHILE ANCHORING THE
CONTEXT OF THEIR EVOLUTION WITHIN A PROBABILISTIC ENVELOPE. EXPECT
THE CONTINUED DOMINANCE OF THE BERING SEA VORTEX--WITH A RELOADING
OCCURRING LATE IN THE PERIOD--AND A READVANCEMENT OF THE POLAR
FRONT ABOUT HALFWAY ACROSS THE GULF OF ALASKA. BY EARLY NEXT WEEK,
WHATEVER MODESTLY COLD AIR ALONG THE NORTH SLOPE AND DEEP INTERIOR
SHOULD DRAIN AWAY AS HEIGHTS BEGIN TO BUILD.


CISCO

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