211  
FZAK80 PAFC 152209  
ICEAFC  
 
SEA ICE ADVISORY FOR WESTERN AND ARCTIC ALASKAN COASTAL WATERS  
NATIONAL WEATHER SERVICE ANCHORAGE ALASKA  
207 PM AKDT WEDNESDAY 15 AUGUST 2018  
 
FORECAST VALID...MONDAY 20 AUGUST 2018  
 
ANALYSIS CONFIDENCE...HIGH TO MODERATE  
 
SYNOPSIS...LOW PRESSURE WILL CONTINUE TO DROP SOUTHWARD FROM THE  
HIGH ARCTIC INTO THE BOTH THE BEAUFORT AND CHUKCHI SEAS TONIGHT  
THROUGH FRIDAY, WITH THE LOW CENTER TRACKING SOUTHEASTWARD THROUGH  
THE BEAUFORT SEA TONIGHT THROUGH FRIDAY. ANOTHER LOW CENTER WILL  
BEGIN TO TRACK INTO THE CHUKCHI SEA FRIDAY FROM EASTERN SIBERIAN  
WATERS, AND PUSH EASTWARD INTO THE BEAUFORT THROUGH THE WEEKEND.  
 
-ARCTIC OCEAN-  
-BEAUFORT SEA-  
-CHUKCHI SEA-  
 
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.  
 
-CHUKCHI SEA-  
 
PKZ230-CAPE BEAUFORT TO POINT FRANKLIN-  
 
THE ICE EDGE EXTENDS FROM 71.3N 157W TO 70.9N 163.2W TO 72.3N 163.2W  
TO 72.9N 168.9W TO 72.4N 172W TO 72.6N 176.1W TO 72N 178.9E TO 71.4N  
176.7W TO 69.6N 179.8W TO 70.5N 179.4E TO 69.3N 179.2E. THE ICE EDGE  
IS MAINLY OPEN WATER.  
 
FORECAST FOR THE CHUKCHI SEA (DAYS 1 THROUGH 5)...STEADY WESTERLY  
FLOW, AROUND 10 TO 20 KTS, WILL PERSIST OVER THE CHUKCHI SEA  
THROUGH THURSDAY. THE WINDS WILL BECOME LIGHTER AND SHIFT TO A  
GENERAL NORTH TO NORTHEASTERLY DIRECTION FROM THURSDAY AFTERNOON  
THROUGH FRIDAY, BEFORE THE NEXT SYSTEM TRACKS IN AND BRIEFLY SHIFTS  
THE WINDS TO A MORE SOUTHERLY DIRECTION. SOON AFTER THAT SYSTEM  
TRACKS FARTHER EASTWARD, THE WINDS WILL SHIFT BACK TO NORTHERLY  
BEHIND THE SYSTEM. GENERALLY THE SEA ICE WILL SPREAD OUT AS IT  
DRIFTS EASTWARD THEN SOUTHWARD OVER THE WEEKEND, AND SOME WILL  
LIKELY MELT AS IT REACHES MUCH WARMER WATERS IN THE CHUKCHI SEA. THE  
OVERALL ICE EDGE IS EXPECTED TO MOVE SOUTHEASTWARD 10 TO 20 NM  
THROUGH MONDAY.  
 

 
 
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