214  
FZAK80 PAFC 122237  
ICEAFC  
 
SEA ICE FORECAST FOR WESTERN AND ARCTIC ALASKAN COASTAL WATERS  
NATIONAL WEATHER SERVICE ANCHORAGE ALASKA  
237 PM AKDT MONDAY 12 APRIL 2021  
 
FORECAST VALID...SATURDAY 17 APRIL 2021  
 
ANALYSIS CONFIDENCE...MODERATE.  
 
SYNOPSIS...THE LOW OVER THE NORTHERN BERING SEA WILL SLOWLY WEAKEN  
THROUGH TUESDAY. HIGH PRESSURE BUILDS OVER THE SOUTHERN AND EASTERN  
BERING SEA LATE IN THE WEEK.  
 
-BEAUFORT SEA-  
-CHUKCHI SEA-  
 
PKZ181-NORTH AND WEST OF NUNIVAK ISLAND-  
PKZ200-NORTON SOUND-  
PKZ210-DALL POINT TO WALES-  
PKZ215-KOTZEBUE SOUND-  
PKZ220-WALES TO CAPE THOMPSON-  
PKZ225-CAPE THOMPSON TO CAPE BEAUFORT-  
PKZ230-CAPE BEAUFORT TO POINT FRANKLIN-  
PKZ235-POINT FRANKLIN TO CAPE HALKETT-  
PKZ240-CAPE HALKETT TO FLAXMAN ISLAND-  
PKZ245-FLAXMAN ISLAND TO DEMARCATION POINT-  
PKZ500-WESTERN U.S. ARCTIC OFFSHORE-  
PKZ505-CENTRAL U.S. ARCTIC OFFSHORE-  
PKZ510-EASTERN U.S. ARCTIC OFFSHORE-  
 
ICE COVERED.  
 
-BERING SEA-  
 
PKZ160-BRISTOL BAY-  
PKZ180-KUSKOKWIM DELTA AND ETOLIN STRAIT-  
PKZ185-SAINT MATTHEW ISLAND WATERS-  
PKZ414-BERING SEA OFFSHORE EAST OF 171W-  
 
THE MAIN ICE EDGE IN THE BERING SEA EXTENDS FROM NEAR PILOT POINT TO  
58 20'N 159 31'W TO 58 22'N 162 33'W TO 60 42'N 171 42'W TO 59 58'N  
172 52'W TO 60 22'N 175 17'W TO 59 48'N 177 16'W TO 60 42'N 178 58'E  
AND CONTINUES WEST IN RUSSIAN WATERS. THE ICE EDGE IS MAINLY OPEN  
WATER.  
 
FORECAST FOR THE BERING SEA (DAYS 1 THROUGH 5)...FROM SAINT MATTHEW  
ISLAND WEST, WINDS WILL REMAIN OUT OF THE NORTHWEST THROUGH  
WEDNESDAY. ICE WILL CONTINUE TO ADVANCE, BUT NOT AS VIGOROUSLY AS  
THE LAST FEW DAYS. EXPECT THE EDGE TO ADVANCE 15 TO 20 NM THROUGH  
WEDNESDAY. SOUTHERLY WINDS RETURN ON THURSDAY AND FRIDAY AND WILL  
PUSH BACK THE EDGE 10 TO 20 NM. WARMER AIR WILL ACCOMPANY THOSE  
WINDS, ALLOWING FOR MORE MELTING OF THE STRIP ICE WITH THE RETREAT.  
 
EAST OF SAINT MATTHEW ISLAND, LIGHT SOUTHERLY WINDS AND WARMER AIR  
WILL CONTINUE THE RETREAT THROUGH TUESDAY, ANOTHER 10 NM. WEDNESDAY  
THROUGH FRIDAY, NORTHWESTERLY WINDS INCREASE IN STRENGTH WHICH WILL  
BRING THE EDGE SOUTHWARD 15 TO 20 NM.  
 
-COOK INLET-  
 
ANALYSIS CONFIDENCE...LOW.  
 
PKZ130-WEST OF BARREN ISLANDS INCLUDING KAMISHAK BAY-  
PKZ139-COOK INLET KALGIN ISLAND TO PT. BEDE-  
PKZ140-COOK INLET NORTH OF KALGIN ISLAND-  
 
THE MAIN ICE EDGE IN COOK INLET EXTENDS FROM 60 27'N 152 19'W TO 60  
41'N 151 54'W TO 60 30'N 151 41'W TO 60 45'N 151 25'W TO 60 55'N 150  
53'W TO 60 52'N 150 53'W. THE ICE EDGE IS MAINLY OPEN WATER.  
 
FORECAST FOR COOK INLET (DAYS 1 THROUGH 5)...MODERATE NORTHERLY  
WINDS INCREASE THROUGH WEDNESDAY BEFORE SLOWLY DECREASING THE  
REMAINDER OF THE WEEK. TEMPERATURES WILL CONTINUE TO BE MODERATE  
AND CLOSER TO NORMAL. LITTLE IF ANY NEW SEA ICE FORMATION IS  
EXPECTED, AND THE EXISTING SEA ICE WILL CONTINUE TO MELT DURING THE  
FORECAST PERIOD. THE NORTHERLY WINDS WILL CARRY SOME ICE BACK  
SOUTHWARD 10 TO 20 NM.  
 
PLEASE NOTE THAT COOK INLET ICE CHANGES SIGNIFICANTLY WITH THE  
TIDES.  
 

 
LAWSON  
 
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