919  
FZAK80 PAFC 212320  
ICEAFC  
 
SEA ICE ADVISORY FOR WESTERN AND ARCTIC ALASKAN COASTAL WATERS  
NATIONAL WEATHER SERVICE ANCHORAGE ALASKA  
320 PM AKDT FRIDAY 21 APRIL 2017  
 
FORECAST VALID...WEDNESDAY 26 APRIL 2017  
 
ANALYSIS CONFIDENCE...HIGH  
 
SYNOPSIS...HIGH PRESSURE WILL PERSIST OVER THE SOUTHERN CHUKCHI AND  
BEAUFORT SEAS THROUGH WEDNESDAY. LOW PRESSURE WILL SLOWLY MOVE  
EASTWARD ACROSS THE ALEUTIAN ISLANDS THROUGH WEDNESDAY.  
 
-ARCTIC OCEAN-  
-BEAUFORT SEA-  
-CHUKCHI SEA-  
PKZ510-EASTERN U.S. ARCTIC OFFSHORE-  
PKZ505-CENTRAL U.S. ARCTIC OFFSHORE-  
PKZ500-WESTERN U.S. ARCTIC OFFSHORE-  
PKZ245-FLAXMAN ISLAND TO DEMARCATION POINT-  
PKZ240-CAPE HALKETT TO FLAXMAN ISLAND-  
PKZ235-POINT FRANKLIN TO CAPE HALKETT-  
PKZ230-CAPE BEAUFORT TO POINT FRANKLIN-  
PKZ225-CAPE THOMPSON TO CAPE BEAUFORT-  
PKZ220-WALES TO CAPE THOMPSON-  
PKZ215-KOTZEBUE SOUND-  
PKZ200-NORTON SOUND-  
 
ICE COVERED.  
 
-BERING SEA-  
 
PKZ181-NORTH AND WEST OF NUNIVAK ISLAND-  
PKZ210-DALL POINT TO WALES-  
 
ICE COVERED.  
 
PKZ160-BRISTOL BAY-  
PKZ165-PORT HEIDEN TO CAPE SARICHEF-  
PKZ180-KUSKOKWIM DELTA TO ETOLIN STRAIT-  
PKZ185-SAINT MATTHEW ISLAND WATERS-  
PKZ412-BERING SEA OFFSHORE 171W TO 180 AND N OF 56N-  
PKZ414-BERING SEA OFFSHORE EAST OF 171W-  
 
THE MAIN ICE EDGE IN THE BERING SEA EXTENDS FROM NEAR CAPE NEWENHAM  
TO 59.9N 165.2W TO 58N 167.1W TO 58.3N 171.9W TO 62N 178.3W TO 63.8N  
175.8W TO 63.5N 172.8W TO 62.2N 171.9W TO 63N 169.8W TO 63.8N 171.6W  
AND CONTINUES IN RUSSIAN WATERS. THE ICE EDGE IS MAINLY OPEN WATER.  
SEA ICE ALSO REMAINS IN SHALLOW BAYS AND OTHER PROTECTED AREAS ALONG  
THE BRISTOL BAY COAST.  
 
FORECAST THROUGH WEDNESDAY FOR THE BERING SEA...WINDS WILL GENERALLY  
BE NORTHERLY TO EASTERLY ACROSS THE ICE EDGE THROUGH WEDNESDAY. THE  
ICE EDGE IS EXPECTED TO MOVE MAINLY WESTWARD 20 TO 35 NM THROUGH  
MONDAY. SEA ICE ALONG THE BRISTOL BAY COAST WILL ALSO CONTINUE TO  
GRADUALLY MELT THROUGH MONDAY.  
 
-COOK INLET-  
PKZ140-COOK INLET NORTH OF KALGIN ISLAND-  
 
COOK INLET ANALYSIS CONFIDENCE...HIGH TO MODERATE  
 
SYNOPSIS FOR COOK INLET...WEAK HIGH PRESSURE WILL REMAIN OVER  
SOUTHCENTRAL ALASKA THROUGH WEDNESDAY. LOW PRESSURE WILL APPROACH  
THE GULF OF ALASKA MONDAY THROUGH WEDNESDAY.  
 
THE MAIN ICE EDGE IN COOK INLET EXTENDS FROM NEAR 60.9N 150.6W TO  
61.1N 151.1W. THE ICE EDGE IS MAINLY OPEN WATER.  
 
FORECAST THROUGH WEDNESDAY FOR COOK INLET...WINDS WILL GENERALLY  
REMAIN LIGHT AND VARIABLE...BECOMING NORTHERLY AT TIMES THROUGH  
WEDNESDAY. DAYTIME TEMPERATURES ARE FORECAST TO BE IN THE UPPER 40S  
AND LOWER 50S WITH OVERNIGHT LOWS NEAR OR SLIGHTLY ABOVE FREEZING.  
 
THE REMAINING SEA ICE IN COOK INLET WILL CONTINUE TO MOVE  
WITH THE TIDES AND MELT THROUGH WEDNESDAY.  
 
PLEASE NOTE...COOK INLET ICE CHANGES SIGNIFICANTLY WITH THE TIDES.  
 

 
 
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