SEA ICE ADVISORY FOR WESTERN AND ARCTIC ALASKAN COASTAL WATERS NATIONAL WEATHER SERVICE ANCHORAGE ALASKA 230 PM AKDT MONDAY SEPTEMBER 22 2008
FORECAST VALID...SATURDAY SEPTEMBER 27 2008
ANALYSIS CONFIDENCE...HIGH.
SYNOPSIS...HIGH PRESSURE WILL BUILD OVER THE BEAUFORT SEA THROUGH WEDNESDAY. A DEVELOPING ARCTIC LOW WILL DROP INTO THE CENTRAL BEAUFORT SEA FRIDAY AND SATURDAY.
-ARCTIC OCEAN- -BEAUFORT SEA- -CHUKCHI SEA-
PKZ245-FLAXMAN ISLAND TO DEMARCATION POINT-
THE ICE EDGE LIES FROM THE SOUTHWEST COAST OF BANKS ISLAND TO 70.9N 133.2W TO 70.5N 139.7W TO 71.6N 145.6W TO 72.7N 145.8W TO 73.1N 139.8W TO 75.4N 143.5W TO 76.5N 156.1W TO 77.5N 166.7W TO 74.5N 172.4W TO 74.2N 176E AND CONTINUES WEST. THE EDGE EAST OF 175W IS 1 TO 6 TENTHS FIRST YEAR AND OLD ICE. THE EDGE WEST OF 175W IN OUR ANALYSIS AREA IS OPEN WATER.
2 TO 4 TENTHS FIRST YEAR AND OLD ICE LIES BETWEEN 73N AND 74N FROM 163W TO 168W.
FORECAST THROUGH SATURDAY...MUCH COLDER AIR WILL SPREAD ACROSS THE BEAUFORT SEA AFTER WEDNESDAY. NEW ICE WILL DEVELOP IN MUCH OF THE ICE FREE WATERS BETWEEN 140W AND 155W WHERE SEA SURFACE TEMPERATURES ARE 1C OR LESS. ICE WILL DEVELOP ALONG THE ALASKA BARRIER ISLANDS ALONG THE NORTHWEST AND NORTH COASTS NORTH OF 70N.
A NOTE ON THE ICE FORECAST...SEA SURFACE TEMPERATURES ALONG THE ALASKA CHUKCHI AND BEAUFORT SEA COASTS ARE 2 TO 8 DEGREES CELSIUS COLDER THIS YEAR THAN AT THE SAME TIME LAST YEAR. SEA ICE IN THESE AREAS IS AT OR VERY NEAR THE SEASONAL MINIMUM. SIGNIFICANT ICE WILL BEGIN DEVELOPING ALONG THE ALASKA COAST NORTH OF 70N WITHIN THE NEXT 10 TO 14 DAYS.
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FZAK80 PAFC 222231
ICEAFC
NWS Anchorage
SEA ICE ADVISORY FOR WESTERN AND ARCTIC ALASKAN COASTAL WATERS
NATIONAL WEATHER SERVICE ANCHORAGE ALASKA
230 PM AKDT MONDAY SEPTEMBER 22 2008
FORECAST VALID...SATURDAY SEPTEMBER 27 2008
ANALYSIS CONFIDENCE...HIGH.
SYNOPSIS...HIGH PRESSURE WILL BUILD OVER THE BEAUFORT SEA THROUGH
WEDNESDAY. A DEVELOPING ARCTIC LOW WILL DROP INTO THE CENTRAL
BEAUFORT SEA FRIDAY AND SATURDAY.
-ARCTIC OCEAN-
-BEAUFORT SEA-
-CHUKCHI SEA-
PKZ245-FLAXMAN ISLAND TO DEMARCATION POINT-
THE ICE EDGE LIES FROM THE SOUTHWEST COAST OF BANKS ISLAND TO 70.9N
133.2W TO 70.5N 139.7W TO 71.6N 145.6W TO 72.7N 145.8W TO 73.1N
139.8W TO 75.4N 143.5W TO 76.5N 156.1W TO 77.5N 166.7W TO 74.5N
172.4W TO 74.2N 176E AND CONTINUES WEST. THE EDGE EAST OF 175W IS 1
TO 6 TENTHS FIRST YEAR AND OLD ICE. THE EDGE WEST OF 175W IN OUR
ANALYSIS AREA IS OPEN WATER.
2 TO 4 TENTHS FIRST YEAR AND OLD ICE LIES BETWEEN 73N AND 74N FROM
163W TO 168W.
FORECAST THROUGH SATURDAY...MUCH COLDER AIR WILL SPREAD ACROSS THE
BEAUFORT SEA AFTER WEDNESDAY. NEW ICE WILL DEVELOP IN MUCH OF THE ICE
FREE WATERS BETWEEN 140W AND 155W WHERE SEA SURFACE TEMPERATURES ARE
1C OR LESS. ICE WILL DEVELOP ALONG THE ALASKA BARRIER ISLANDS ALONG
THE NORTHWEST AND NORTH COASTS NORTH OF 70N.
A NOTE ON THE ICE FORECAST...SEA SURFACE TEMPERATURES ALONG THE
ALASKA CHUKCHI AND BEAUFORT SEA COASTS ARE 2 TO 8 DEGREES CELSIUS
COLDER THIS YEAR THAN AT THE SAME TIME LAST YEAR. SEA ICE IN THESE
AREAS IS AT OR VERY NEAR THE SEASONAL MINIMUM. SIGNIFICANT ICE WILL
BEGIN DEVELOPING ALONG THE ALASKA COAST NORTH OF 70N WITHIN THE NEXT
10 TO 14 DAYS.
KCOLE SEPTEMBER 2008
BB
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