Ice Forecast
Issued by NWS Anchorage, AK

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FZAK80 PAFC 222245
ICEAFC

SEA ICE ADVISORY FOR WESTERN AND ARCTIC ALASKAN COASTAL WATERS
NATIONAL WEATHER SERVICE ANCHORAGE ALASKA
245 PM AKDT MONDAY 22 MAY 2017

FORECAST VALID...SATURDAY 27 MAY 2017

ANALYSIS CONFIDENCE...HIGH

SYNOPSIS...AN AREA OF LOW PRESSURE WILL MOVE ACROSS THE NORTHERN
BERING SEA THROUGH WEDNESDAY MORNING BEFORE STALLING NEAR SAINT
LAWRENCE ISLAND AND EVENTUALLY DISSIPATING THURSDAY MORNING. A
SECOND LOW PRESSURE SYSTEM WILL MOVE FROM THE ALASKA INTERIOR INTO
THE CHUKCHI SEA LATE WEDNESDAY NIGHT BEFORE STALLING OVER THE BERING
SEA AND DISSIPATING FRIDAY NIGHT.

-ARCTIC OCEAN-
-BEAUFORT SEA-
PKZ510-EASTERN U.S. ARCTIC OFFSHORE-
PKZ505-CENTRAL U.S. ARCTIC OFFSHORE-
PKZ500-WESTERN U.S. ARCTIC OFFSHORE-
PKZ245-FLAXMAN ISLAND TO DEMARCATION POINT-
PKZ240-CAPE HALKETT TO FLAXMAN ISLAND-
PKZ235-POINT FRANKLIN TO CAPE HALKETT-

ICE COVERED.

-CHUKCHI SEA-
PKZ200-NORTON SOUND-
PKZ215-KOTZEBUE SOUND-
PKZ220-WALES TO CAPE THOMPSON-
PKZ225-CAPE THOMPSON TO CAPE BEAUFORT-
PKZ230-CAPE BEAUFORT TO POINT FRANKLIN-

THE MAIN ICE EDGE IN THE CHUKCHI SEA EXTENDS FROM A POINT NEAR 65.8N
168.4W TO 66.0N 168.2W TO 66.4N 169.1W TO 67.3N 169.6W TO 67.4N
171.4W TO 66.1N 169.6W. THE ICE EDGE IS MAINLY OPEN WATER.

FORECAST THROUGH SATURDAY FOR THE CHUKCHI SEA...LIGHT NORTHEASTERLY
WINDS WILL BEGIN TO BECOME VARIABLE TUESDAY NIGHT. WINDS WILL SHIFT
TO THE SOUTHWEST THURSDAY MORNING AND REMAIN FROM THAT DIRECTION
THROUGH SATURDAY. THE ICE EDGE IS EXPECTED TO MOVE TO THE WEST-
SOUTHWEST 10 TO 15 NM THROUGH SATURDAY...WITH PIECES OF THE MAIN ICE
PACK BREAKING OFF AND MELTING THROUGH THE FORECAST PERIOD AS THEY
MOVE INTO WARMER WATER.

-BERING SEA-
PKZ160-BRISTOL BAY-
PKZ165-PORT HEIDEN TO CAPE SARICHEF-
PKZ180-KUSKOKWIM DELTA TO ETOLIN STRAIT-
PKZ181-NORTH AND WEST OF NUNIVAK ISLAND-
PKZ185-SAINT MATTHEW ISLAND WATERS-
PKZ210-DALL POINT TO WALES-
PKZ412-BERING SEA OFFSHORE 171W TO 180 AND N OF 56N-
PKZ414-BERING SEA OFFSHORE EAST OF 171W-

THE MAIN ICE EDGE IN THE BERING SEA EXTENDS FROM THE ALASKA COAST
NEAR 64.3N 161.2W TO 63.8N 166.7W TO 64.9N 167.2W TO 65.8N 168.3W
AND CONTINUES THROUGH THE BERING STRAIT. THERE IS ALSO SEA ICE
PRESENT ALONG THE RUSSIAN COAST AND ON THE NORTHEAST SIDE OF SAINT
LAWRENCE ISLAND AND ICE ALONG THE SOUTHERN PORTION OF NORTON SOUND.
THE ICE EDGE IS MAINLY OPEN WATER.

THERE IS ALSO AN ICE FLOW THAT EXTENDS NORTH FROM SAINT MATTHEW
ISLAND FROM 61.3N 172.6W TO 61.0N 171.5W TO 61.2N 170.2W TO 61.7N
172.3W TO 61.1N 174.7W TO 61.3N 176.8W TO 60.9N 177.2W TO 60.4N
174.0W TO 61.3N 172.6W.

ANOTHER ICE FLOW EXTENDS SOUTH TO NORTH FROM 63.1N 167.4W TO 63.3N
166.6W TO 63.7N 167.1W TO 63.6N 168.0W TO 63.1N 167.4W.

FORECAST THROUGH SATURDAY FOR THE BERING SEA...INCREASING
SOUTHWESTERLY WINDS ARE EXPECTED WITH THE LOW MOVING ACROSS THE
NORTHERN BERING SEA. WINDS WILL BEGIN TO SHIFT TO THE NORTHWEST
BEHIND THE LOW ON WEDNESDAY BUT THE NORTHERN AND EASTERN BERING SEA
WILL NOT SEE THE NORTHWESTERLY WINDS UNTIL THURSDAY. WINDS WILL THEN
WEAKEN AND SHIFT TO THE WEST THROUGH SATURDAY. THE REMAINING BERING
SEA ICE PACK IS EXPECTED TO CONTINUE TO SPREAD OUT AND GRADUALLY
MELT THROUGH THE FORECAST PERIOD...WITH SOME OF THE ICE BEING
DESTROYED BY THE ADVANCING LOW PRESSURE SYSTEM THROUGHOUT THE WEEK.

$$



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