Sea Ice Advisory


FZAK80 PAFC 232255
ICEAFC

Sea Ice Advisory for Western and Arctic Alaskan Coastal Waters 
National Weather Service Anchorage Alaska 
230 PM AKST Friday 23 February 2018

FORECAST VALID...Wednesday 28 February 2018

ANALYSIS CONFIDENCE...Moderate to High

SYNOPSIS...A front will move inland today, followed by another low 
and front moving into the Bering Sea on Sunday. The fronts should 
hang up along an east/west boundary near 60N. The active pattern 
continues through Wednesday, with a stronger western Bering system 
that will bring southeasterly flow further northward. 

-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 58.8N 157W to 
58.5N 162.2W to 59.3N 162.6W to 60N 165.8W to 62.0N 171.1W to 62.6N 
169.9W to 63.6N 172.2W to 65N 170.8W to 64.1N 172.5W and continues 
in Russian waters. A large area of open water exists around and to 
the north of Nunivak island with an area of brash ice to the south 
and east. 

FORECAST FOR THE BERING SEA (Days 1 through 5)...N of 60N, winds 
will remain northerly through late Sunday before turning to the 
west/northwest through Wednesday. Expect the ice edge to move to the 
south 10 to 15 nm through Wednesday. Expect new growth where ice has 
melted in previous weeks as conditions have become more favorable. 

S of 60N, westerly winds will remain through Sunday afternoon when 
easterly and southerly wind will return. Winds will flip to the west 
on Monday and Tuesday before easterly flow returns on Wednesday. The 
ice edge will see little movement, but any areas of ice could be 
advected 15 to 25nm westward through the period. Little growth of 
new ice is expected. 




-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 High 

SEA ICE EDGE DISCUSSION...The main ice edge within Cook Inlet 
extends from 60.3N 151.4W to 59.8N 152.5W to 59.8N 152.6W. The ice 
edge is mainly open water.

FORECAST FOR COOK INLET (Days 1 through 5)...Winds will generally 
remain light and generally from the north through Monday. Expect 
little growth or movement through Monday. On Tuesday and Wednesday, 
a much colder airmass comes overhead which should allow for new 
growth around the area. Please note...Cook Inlet sea ice changes 
significantly with the tides.

$$