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Alaska Extended Forecast Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1824Z Oct 18, 2014)
 
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ALASKA EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
224 PM EDT SAT OCT 18 2014

VALID 12Z WED OCT 22 2014 - 12Z SUN OCT 26 2014

THE ALASKA MEDIUM RANGE FORECAST CONTINUED WITH AN ECENS/ECMWF
THEME FOR DAYS 4-8. A BROAD CYCLONE CURRENTLY IN THE GULF OF
ALASKA WILL BEGIN TO MIGRATE SOUTHEASTWARD AS SUBSTANTIAL WESTERLY
FLOW OFF THE EAST CENTRAL ASIA COAST BEGINS TO UNDERCUT THE
CYCLONE AND SHORTWAVE ENERGY CARVES A GRADUAL ELONGATION OF THE
CYCLONE INVOF 140W LONGITUDE. THE AMPLITUDE AND TILT OF THE
UPPER-LEVEL TROUGH ALONG 140W WILL BE THE CHALLENGING PART OF THE
FORECAST. ACROSS THE PANHANDLE...THE TREND WILL BE FOR DECREASING
PRECIPITATION AMOUNTS...INTENSITY AND CHANCES---WITH A DRIER
AIRMASS WORKING NORTH TO SOUTH DURING THIS MEDIUM RANGE PERIOD.
THE OPPOSITE WILL BE TRUE IN THE WEST AND SOUTHWEST
COAST---INCLUDING THE YUKON DELTA.

VOJTESAK