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Alaska Extended Forecast Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1818Z Sep 11, 2014)
 
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ALASKA EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
218 PM EDT THU SEP 11 2014

VALID 12Z MON SEP 15 2014 - 12Z FRI SEP 19 2014

THE INFUSION OF REMNANT 'FENGSHEN' MOISTURE AND ENERGY WILL
MAINTAIN A HIGHLY-AMPLIFIED DOWNSTREAM RIDGE OVER THE ALASKA
PANHANDLE AND WESTERN CANADA THROUGH DAY 7. THE EMERGING
UPPER-LEVEL CYCLONE IN THE SOUTHEAST BERING SEA GRADUALLY SHIFTS
EAST-SOUTHEASTWARD AND ENTERS THE WESTERN GULF OF ALASKA TO THE
SOUTH AND EAST OF KODIAK ISLAND. THIS MEDIUM RANGE FORECAST
PERIOD---AN UPPER-LEVEL CYCLONE POSITIONED IN THE GULF OF ALASKA
WILL BE MORE CONDUCIVE FOR A SECONDARY CYCLOGENESIS TRACK INTO THE
NORTHERN PANHANDLE AND SOUTH CENTRAL COAST---AND EVENTUAL
DISPLACEMENT AND MIGRATION OF THE DOWNSTREAM RIDGE.

THE CURRENT DAY 4-8 500MB AND SURFACE GRAPHICS EASILY MAINTAINED
CONTINUITY USING A HEAVILY-WEIGHTED 11/00Z ECENS/ECMWF SOLUTION.
THE GENERAL SENSIBLE WEATHER PATTERN FOR MUCH OF THE GULF WILL BE
AN INCREASINGLY WINDY AND WET ONE AS A SERIES OF PROGRESSIVELY
STRONGER MID-LEVEL WAVES PROPAGATE COUNTERCLOCKWISE AROUND THE
BASE OF THE UPPER-LEVEL CYCLONE.

VOJTESAK