Prognostic Meteorological Discussion
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FXAK02 KWNH 311843
PMDAK

ALASKA EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
243 PM EDT MON AUG 31 2015

VALID 12Z FRI SEP 04 2015 - 12Z TUE SEP 08 2015

THE ALASKA MEDIUM RANGE PERIOD CONTINUES WITH A NORTHERN STREAM
DOMINANT FLOW PATTERN `THEME` AND A WNW-TO-ESE STORM TRACK IN THE
GULF OF ALASKA. A SERIES OF FAST-MOVING SYSTEMS WILL TRY TO
`SPLIT` AS THEY MOVE FROM THE EASTERN ALEUTIANS TO THE PACIFIC
NORTHWEST COAST OF WASHINGTON. THIS SHOULD ALLOW BRIEF PERIODS OF
MID-LEVEL WARM ADVECTION TO MOVE ACROSS THE NORTHEAST GULF AND
BRUSH THE PANHANDLE---WITH THE BULK OF THE COOLER...MARITIME
PACIFIC AIR SURGING SOUTHEASTWARD TOWARDS THE CENTRAL COAST OF
NORTH AMERICA DURING THE PERIOD.

THOUGHT THE 31/00Z ECENS...ITS DETERMINISTIC RUN AND THE 31/12Z
THE DETERMINISTIC GFS WERE IN GOOD AGREEMENT ALOFT WITH THE
PATTERN AND PROVIDE GOOD SEPARATION BETWEEN HIGH-LATITUDE AND
SUBTROPICAL AIR STREAMS DURING THIS PARTICULAR MEDIUM RANGE
PERIOD.

VOJTESAK






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