Sea Ice Advisory


FZAK80 PAFC 182059
ICEAFC

SEA ICE ADVISORY FOR WESTERN AND ARCTIC ALASKAN COASTAL WATERS 
NATIONAL WEATHER SERVICE ANCHORAGE ALASKA 
1258 PM AKDT MONDAY 18 AUGUST 2014 

FORECAST VALID...SATURDAY 23 AUGUST 2014

ANALYSIS CONFIDENCE...MODERATE.

SYNOPSIS...A WEAK PATTERN OF MAINLY HIGH PRESSURE WILL PERSIST OVER 
MUCH OF THE CHUKCHI AND BEAUFORT SEAS THROUGH LATE THURSDAY. HIGH 
PRESSURE WILL DEVELOP OVER NORTHERN ALASKA BY FRIDAY AND BUILD 
NORTHWARD SATURDAY BEHIND A TROF OF LOW PRESSURE TRACKING EASTWARD 
ACROSS THE ARCTIC OCEAN.

-ARCTIC OCEAN-

ICE COVERED.

-CHUKCHI SEA-
PKZ230-CAPE BEAUFORT TO POINT FRANKLIN-
PKZ235-POINT FRANKLIN TO CAPE HALKETT-

THE MAIN ICE EDGE LIES FROM A POINT ROUGHLY 78 NM NORTH OF POINT 
BARROW TO 71.9N 164.1W TO 72.0N 166.9W TO 73.4N 168.5W TO 73.3N 
172.3W TO 73.3N 180 AND CONTINUES TO THE WEST IN THE RUSSIA ARCTIC. 
THE ICE EDGE RANGES FROM OPEN WATER TO 2 TENTHS FIRST YEAR AND OLD 
BRASH SEA ICE. 

FORECAST THROUGH SATURDAY FOR THE CHUKCHI SEA...LIGHT AND MOSTLY 
SOUTHERLY FLOW WILL BECOME SOUTHWESTERLY LATE TUESDAY AND WENDESDAY. 
LIGHT TO MODERATE SOUTH WINDS WILL DEVELOP THURSDAY BECOMING 
SOUTHWESTERLY FRIDAY THROUGH SATURDAY. THE ICE EDGE WILL RETREAT 
NORTH 15 TO 25 NM THROUGH SATURDAY.
  

-BEAUFORT SEA-
PKZ240-CAPE HALKETT TO FLAXMAN ISLAND-
PKZ245-FLAXMAN ISLAND TO DEMARCATION POINT-

THE MAIN ICE EDGE LIES FROM THE NORTHWEST COAST OF BANKS ISLAND AT 
73.5N 124.3W TO 71.1N 132.5W TO 71.3N 137.5W TO 72.8N 144.4W TO A 
POINT ROUGHLY 78 NM NORTH OF POINT BARROW.
 
AN ISOLATED AREA OF BRASH SEA ICE REMAINS JUST BEYOND THE BARRIER 
ISLANDS FROM NEAR PRUDHOE BAY OVER TO NEAR FLAXMAN ISLAND. THIS AREA 
OF BRASH ICE IS EXPECTED TO MELT OFF BY THE END OF THE 
FORECAST PERIOD. THE ICE EDGE IS MAINLY OPEN WATER. 

FORECAST THROUGH SATURDAY FOR THE BEAUFORT SEA...EASTERLY FLOW ALONG 
THE ICE EDGE WILL BECOME LIGHT AND VARIABLE BY LATE TUESDAY. WEST 
AND SOUTHWEST FLOW WILL DEVELOP BY EARLY THURSDAY AND BECOME WEST 
NORTHWEST FRIDAY THROUGH SATURDAY. THE OVERALL ICE EDGE IS EXPECTED 
TO SHIFT 10 TO 20 NM IN A MOSTLY NORTHEAST DIRECTION BY LATE 
SATURDAY.