Ice Forecast
Issued by NWS Anchorage, AK

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000
FZAK80 PAFC 152350
ICEAFC

Sea Ice Advisory for Western and Arctic Alaskan Coastal Waters
National Weather Service Anchorage Alaska
250 PM AKST Friday 15 December 2017

FORECAST VALID...Wednesday 20 December 2017
ANALYSIS CONFIDENCE...High to moderate

SYNOPSIS...A series of lows will move northeastward through the
Bering Sea through Wednesday. High pressure will remain over the
Arctic Ocean through Wednesday.

-Arctic Ocean-
-Beaufort Sea-
-Chukchi Sea-
-Bering Sea-
PKZ200-Norton Sound-
PKZ215-Kotzebue Sound-
PKZ235-Point Franklin to Cape Halkett-
PKZ240-Cape Halkett to Flaxman Island-
PKZ245-Flaxman Island to Demarcation Point-
PKZ505-Central U.S. Arctic Offshore-
PKZ510-Eastern U.S. Arctic Offshore-

Ice covered.

-Chukchi Sea-
PKZ220-Wales to Cape Thompson-
PKZ225-Cape Thompson to Cape Beaufort-
PKZ230-Cape Beaufort to Point Franklin-
PKZ500-Western U.S. Arctic Offshore-

FORECAST FOR THE CHUKCHI SEA (Days 1 through 5)...Easterly to
northeasterly winds will continue through Monday...then winds will
become southerly Tuesday through Wednesday. The remaining open water
within the Chukchi Sea is expected to continue to fill in through
Monday...then southerly winds Tuesday and Wednesday will likely
break up the thinner ice and push existing ice northward.

-Bering Sea-
PKZ160-Bristol Bay-
PKZ180-Kuskokwim Delta and Etolin Strait-
PKZ181-North and west of Nunivak Island-
PKZ210-Dall Point to Wales-

SEA ICE EDGE DISCUSSION...The main ice edge in the Bering Sea
extends from 59.1N 162W to 61N 167.4W to 65.4N 168.6W to 64.3N
172.8W and continues in Russian waters. There is also new ice near
the coastline of Saint Lawrence Island as well as within shallow and
protected areas of Bristol Bay. The ice edge is mainly open water.

FORECAST FOR THE BERING SEA(Days 1 through 5)...Winds will be
variable through Wednesday as the lows move through the Bering Sea.
Some sea ice is expected to be destroyed by wind and wave action
through Wednesday. The overall ice edge is expected to retreat 10 to
20 nm toward the Alaska coast through Wednesday.

-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...High to moderate

SEA ICE EDGE DISCUSSION...The main ice edge within Cook Inlet
extends from near 60.9N 150.9W to 61N 151W to 61N 150W to 61.2N
150.7W to 61n 151.2w. 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 are
expected to remain below freezing through Wednesday. New sea ice can
be expected to form within upper Cook Inlet with the below-
freezing temperatures.

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

$$



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