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Friday, 29 April 2011 - Sea Ice for Walrus Outlook

Weekly Outlook

Date: 
29 April 2011
Assessment of Current Ice Conditions Relevant to Distribution and Access of Walrus: 

Near St. Lawrence Island

Sea ice conditions have not changed much since last week. Air temperatures remain below freezing and NE winds have pushed the sea ice pack up against the north shore of St. Lawrence Island. Sea ice south of the island remains 2 to 4 tenths new/young with lots of open water and leads. Satellite imagery shows open water along the shorefast ice by the presence of low cloud formations just south of the open water. This is also the case along the western shore of St. Lawrence Island. Heavy concentrations of thicker ice occur along the coast from Savoonga eastward. In general the area will continue to have northerly winds that will keep similar ice conditions through Monday, 9 May.

Wales to Shishmaref

Again, sea ice conditions have not changed much since last week. The northeast winds have pushed most of the heavy and larger floes westward into the central and western Bering Strait. The shorefast ice off Shishmaref continues to hold in place. Northerly winds will continue through Monday, 9 May and this will keep ice conditions nearly the same.

5 to 10 Day Forecast

At present there is a low over the central Aleutians and a high over the Arctic producing cold, northerly winds. This low will slowly drift into the western Gulf of Alaska leaving a weak pressure gradient over the northern Bering Sea beginning late Saturday, 30 April. This will result in light winds 10-15 knots through Wednesday, 4 May. A strong low in the western Aleutians on Wednesday, 4 May will move eastward into the eastern Gulf of Alaska by Friday, 6 May. This will tighten up the gradient over the Bering Sea and produce NE winds 25-30 knots on Thursday, 5 May and Friday, 6 May. A high pressure ridge will form over the western Bering Sea and move slowly eastward bringing light winds Saturday, 7 May.

St. Lawrence Island wind direction and speed
Map of 10-day outlook of wind conditions
Bering Strait wind direction and speed

Arrows show wind direction and wind speed in knots

Remote Sensing Images

Bering Strait
Bering Strait Closeup
St. Lawrence Island Closeup

Observations and Comments

Observations of Sea Ice Development: 

29 April 2011 - Simeon John; local observer in Toksook Bay

Observations on the 7-9 April Bering Sea Storm

During the storm, the river where we park our boats overflowed from high tides, but there were no signs of ice lifting off from the riverbanks or the beaches. At Umkumiut, a fish camp about 5 miles down from where the boats are parked, there were waterlines of flood but no damage. The piles of ice on the northwestern side of the bay below Umkumiut are visible, and there are more Evuuneqs (a Yupik word meaning "piles of ice used as markers") than normal where the pressure of the ice and tide had pushed. Overall, conditions were not very unusual.

The week after, I visited Kasigluk and around the Baird Inlet area there were signs of overflows but no damage to the ice cover.