Sea Ice Advisory

FZAK80 PAFC 172355

Sea Ice Advisory for Western and Arctic Alaskan Coastal Waters 
National Weather Service Anchorage Alaska 
255 PM AKST Wednesday 17 January 2018 

FORECAST VALID...Monday 22 January 2018 

ANALYSIS CONFIDENCE...High to moderate
SYNOPSIS...A trough of low pressure will stretch from the Chukchi 
toward the north coast of Alaska through Friday before lifting into 
the Beaufort then the Arctic through the weekend. High pressure will 
begin to rebuild into the Arctic through Monday.

-Arctic Ocean-
-Beaufort Sea-
-Chukchi Sea-
-Bering Sea-
PKZ200-Norton Sound-
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-
PKZ181-North and west of Nunivak Island-
PKZ210-Dall Point to Wales-

The main ice edge in the Bering Sea extends from near Goodnews Bay 
to 59.9N 164.1W to 61.9N 168.6W to 64.9N 169W to 63.7N 172.3W and 
continues into Russian waters. The ice edge is mainly open water. 
There is a large section of brash ice between the ice edge and Saint 
Lawrence Island.

FORECAST FOR THE BERING SEA (Days 1 through 5)...Northerly winds 
will increase through the next week, mainly over the eastern Bering 
Sea. Further growth of new ice can be expected north of Saint 
Lawrence island. While the ice edge moves southward 20 to 30 NM. 

-Cook Inlet-
PKZ130-West of Barren Islands Including Kamishak Bay-
PKZ139-Cook Inlet Kalgin Island to Pt. Bede-
PKZ140-Cook Inlet North of Kalgin Island-

Analysis confidence...Moderate to low

SEA ICE EDGE DISCUSSION...The main ice edge within Cook Inlet 
extends from near Drift River to Kalgin Island and east towards 
Kenai. There is also sea ice within protected areas on the west side 
of Cook Inlet to Kamishak Bay. The ice edge is mainly open water.

FORECAST FOR COOK INLET (Days 1 through 5)...Temperatures will fall 
below freezing by the end of the week. Continuous down-inlet flow 
may lead to ice breaking off and drifting southward into open waters.

Please note...Cook Inlet sea ice changes significantly with the