Prognostic Meteorological Discussion
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FXAK02 KWNH 271656
PMDAK

ALASKA EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
1256 PM EDT WED MAY 27 2015

VALID 12Z SUN MAY 31 2015 - 12Z THU JUN 04 2015


THE EUROPEAN CENTRE GUIDANCE CONTINUES TO BE MORE STABLE THAN THE
GFS/GEFS, SO BLENDING THE MOST RECENT ECMWF AND ECENS MEAN SHOULD
PROVIDE GOOD CONTINUITY. THE POWERFUL STORM LIFTING INTO THE
BERING SEA FRIDAY WILL HELP TO FORGE A NEW BLOCKING PATTERN ACROSS
ALASKA`S CORNER OF THE NORTHERN HEMISPHERE AT THE MEDIUM RANGE. AN
OMEGA CONFIGURATION IS PROGGED ON THE POLEWARD SIDE OF 60N--THE
UPPER HIGH OVER THE ARCTIC OCEAN AND THE LOW-PRESSURE "ARMS" OVER
KAMCHATKA AND THE CANADIAN ARCHIPELAGO. SHORTWAVE ENERGY DEPARTING
THE KAMCHATKA ARM OF THE OMEGA WILL BE SHUNTED WELL SOUTH OF THE
ALEUTIAN CHAIN TO ANOTHER QUASI-STATIONARY VORTEX NEAR 46N/162W.
THE POSITIONS OF ALL THESE BLOCKING POINTS SHOULD KEEP THE BULK OF
THE ALASKA REGION IN NET WEAK FLOW, WITH NO STRONG SYNOPTIC
FORCING OR IMPORTS OF DEEP-LAYER MOISTURE.


CISCO

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