The melt season for Arctic sea ice is underway after the annual maximum extent was reached late last month. Sea ice extent reached its annual maximum on Feb. 25, 15 days earlier than the 1981-2010 average date and one of the earliest dates for that milestone in the four-decade satellite record.

The main Bering Sea ice pack has begun its retreat to the north after extending to the Pribilofs earlier this month. This winter’s freeze-up has been reminiscent of more historical sea ice conditions.