Sea Ice Advisory


FZAK80 PAFC 312235
ICEAFC

SEA ICE ADVISORY FOR WESTERN AND ARCTIC ALASKAN COASTAL WATERS 
NATIONAL WEATHER SERVICE ANCHORAGE ALASKA 
230 PM AKDT FRIDAY 31 JULY 2015 

FORECAST VALID...WEDNESDAY 5 AUGUST 2015

ANALYSIS CONFIDENCE...MODERATE TO HIGH
                      
SYNOPSIS...LOW PRESSURE OVER THE BEAUFORT SEA WILL MOVE EASTWARD AND 
THROUGH SUNDAY TOWARD THE EASTERN BEAUFORT SEA. ANOTHER LOW WILL 
QUICKLY MOST EASTWARD ACROSS THE CHUKCHI AND BEAUFORT SEAS MONDAY 
AND TUESDAY AND WILL COMBINE WITH THE OTHER LOW ON WEDNESDAY. HIGH 
PRESSURE WILL MOVE OVER THE CHUKCHI SEA ON WEDNESDAY.

-ARCTIC OCEAN-
-BEAUFORT SEA-
-CHUKCHI SEA-
PKZ510-EASTERN US ARCTIC OFFSHORE-
PKZ505-CENTRAL US ARCTIC OFFSHORE- 
PKZ240-CAPE HALKETT TO FLAXMAN ISLAND-

ICE COVERED.

-CHUKCHI SEA-
PKZ500-WESTERN US ARCTIC OFFSHORE-
PKZ230-CAPE BEAUFORT TO POINT FRANKLIN-
PKZ235-POINT FRANKLIN TO CAPE HALKETT-

THE MAIN ICE EDGE LIES FROM THE ALASKA COAST NEAR 71.8N 159.4W TO 
70.9N 161.1W TO 71.9N 165.5W TO 72.5N 161.7W TO 73.9N 179.6W TO 
71.7N 179.8E TO 71.6N 176.6W TO 70.5N 177.6W AND CONTINUES IN 
RUSSIAN WATERS. THE ICE EDGE IS MAINLY OPEN WATER.

FORECAST THROUGH WEDNESDAY FOR THE CHUKCHI SEA...WIND DIRECTION WILL 
VARY GREATLY THROUGH WEDNESDAY AS A SERIES OF LOWS MOVES THROUGH THE 
CHUKCHI SEA AND HIGH PRESSURE EVENTUALLY BUILDS IN OVER THE AREA. 
DURING PERIODS OF SOUTHERLY FLOW...THE ICE WILL SHIFT BACK TO THE 
NORTH AND CONSOLIDATE. DURING PERIODS OF EASTERLY FLOW...THE ICE 
WILL SPREAD APART TO THE WEST. THE OVERALL ICE EDGE IS EXPECTED TO 
BE MINIMAL THROUGH WEDNESDAY. HOWEVER...A DECREASE IN OVERALL 
COVERAGE NEAR THE ICE EDGE IS EXPECTED AS ICE CONTINUES TO MELT 
DURING THIS TIME. 

-BEAUFORT SEA-
PKZ245-FLAXMAN ISLAND TO DEMARCATION POINT-

THE MAIN ICE EDGE LIES FROM NEAR THE SOUTHWEST CORNER OF BANKS 
ISLAND TO THE COAST NEAR 69.2N 138.3W. THE ICE EDGE IS MAINLY OPEN 
WATER.

FORECAST THROUGH WEDNESDAY FOR THE BEAUFORT SEA...WINDS WILL SHIFT 
BETWEEN SOUTHERLY AND WESTERLY THROUGH MONDAY...THEN A BRIEF PERIOD 
OF CALM WINDS ON TUESDAY WILL BE FOLLOWED BY WESTERLY WINDS ON 
WEDNESDAY. THE OVERALL ICE EDGE IS EXPECTED TO SHIFT TO THE 
NORTHEAST 5 TO 15 NM THROUGH WEDNESDAY.
 
$$