Sea Ice Advisory


FZAK80 PAFC 172058
ICEAFC

SEA ICE ADVISORY FOR WESTERN AND ARCTIC ALASKAN COASTAL WATERS 
NATIONAL WEATHER SERVICE ANCHORAGE ALASKA
100 PM AKDT FRIDAY 17 APRIL 2015 

FORECAST VALID...WEDNESDAY 22 APRIL 2015

ANALYSIS CONFIDENCE...MODERATE
                      
SYNOPSIS...A LARGE STRONG LOW SOUTH OF THE CENTRAL ALEUTIANS IS 
EXPECTED TO SHIFT OVER THE SOUTHEAST BERING SEA LATE SATURDAY... 
CONTINUE NORTH OVER THE NORTHERN BERING SEA LATE SUNDAY... AND 
SLOWLY WEAKEN OVER THE NORTHERN BERING SEA THROUGH TUESDAY. A WEAK 
RIDGE OF HIGH PRESSURE IS EXPECTED TO PASS OVER THE SOUTHERN BERING 
SEA LATE TUESDAY INTO WEDNESDAY... WITH ANOTHER LARGE LOW MOVING 
OVER THE WESTERN BERING SEA WEDNESDAY.

-ARCTIC OCEAN-
-BEAUFORT SEA-
-CHUKCHI SEA-

PKZ500-WESTERN US ARCTIC OFFSHORE-
PKZ505-CENTRAL US ARCTIC OFFSHORE-
PKZ510-EASTERN US ARCTIC OFFSHORE-
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-

ICE COVERED.

-BERING SEA-

PKZ215-KOTZEBUE SOUND-
PKZ200-NORTON SOUND-
PKZ210-DALL POINT TO WALES-
PKZ180-KUSKOKWIM DELTA AND ETOLIN STRAIT-
PKZ181-NORTH AND WEST OF NUNIVAK ISLAND-
PKZ185-SAINT MATTHEW ISLAND WATERS-

THE MAIN ICE EDGE LIES FROM NEAR CAPE NEWENHAM 58.2N 162.6W TO 58.5N 
164.3W TO 58.2N 166.7W TO 57.7N 167.1W TO 57.9N 169.6W TO 57.4N 
171.3W TO TO 57.4N 172.6W TO 61.0N 179.6W AND CONTINUES ALONG THE 
RUSSIAN COAST. THE ICE EDGE IS OPEN WATER. 

FORECAST THROUGH WEDNESDAY FOR THE BERING SEA...MODERATE 
NORTHEASTERLY WINDS OVER THE ICE EDGE FRIDAY NIGHT ARE EXPECTED TO 
BECOME MODERATE TO STRONG NORTHERLY FLOW ON SATURDAY. WIND FLOW IS 
EXPECTED TO BECOME NORTHWESTERLY SATURDAY NIGHT... WITH MODERATE TO 
LIGHT WINDS PERSISTING OUT OF THE NORTHWEST TO WEST SUNDAY THROUGH 
TUESDAY. 

THE ICE EDGE IS EXPECTED TO SHIFT TO THE SOUTHWEST DURING THE 
PERIODS OF MODERATE TO STRONG NORTHERLY TO NORTHEASTERLY FLOW EARLY 
IN THE FORECAST PERIOD. THE ICE EDGE DURING THIS TIME WILL CONSIST 
OF STRIPS OF ICE. AS THE WINDS BECOME NORTHWESTERLY SATURDAY NIGHT 
THE STRIPS OF ICE WILL SLOWLY SHIFT BACK TO THE SOUTHEAST. THE NET 
CHANGE TO THE ICE EDGE THROUGH WEDNESDAY IS EXPECTED TO BE 15 TO 30 
NM TO THE SOUTH-SOUTHEAST... WITH THE GREATEST MOVEMENT BETWEEN 167W 
AND 178W. THE ICE EDGE IS EXPECTED TO INCLUDE AN AREA OF OPEN WATER 
FOLLOWED BY STRIPS OF ICE AND SLOWLY ROTTING ICE FLOES.
 
$$