Sea ice extent in the Bering Sea during April continued to decline during the month and was easily the lowest of record. The average sea extent for April of 146,000 km² was only 21% of the 1981-2010 average and less than half of the previous lowest April extent (in 1989).
Heavy snow fell over parts of the Kenai Peninsula and western Prince William Sound on April 4. Main Bay (near Whittier) reported 15" (38cm) and Alyeska 10" (25"), while 11" (28cm) was reported just north of Seward.
The maximum extent of sea ice in the Bering Sea for the 2017-18 season was reached on February 7th at just over 410,000 km². This is less than half the normal maximum seasonal extent and is by far the lowest in the 40-year satellite era database. For the first time, sea ice did not reach St. Matthew Island, and open water was frequent off of St. Lawrence Island.
An unusually strong storm for so late in the season in the southeast Bering Sea brought very strong winds to the Anchorage area on April 24. Winds gusted to 55 mph at Anchorage Airport and 60 mph at Merrill Field, and hillside winds were clocked to 90 to 100 mph in some places. Numerous trees came down in the wind, and nearly 25,000 customers from Anchorage to Chugiak lost electrical power, some for more than 12 hours.
The low temperature at the Anchorage Airport for the entire winter was only -2°F (-19°C), on several days in early February. This ties with the winter of 2002-03 as the second mildest winter low temperature. The only winter in Anchorage history that failed to have even one day below 0°F was 2000-01, when the low was +2°F (-17°C).
Heavy snow fell over parts of central Southeast starting March 26 and continuing into March 27. Total snowfalls included 9.6" (24cm) at Elfin Cove, 9.2" (23cm) at the Juneau Airport, 8.8" (22cm) at Annex Creek and 7.5" at the Snettisham Power Plant.
Heavy snow was reported across the eastern Kenai Peninsula and upper Turnagain Arm area March 8 to 9. In Seward there was an estimated 12" (30cm) of snow, while in Girdwood a storm total of 14" (36cm) was reported. Whittier reported 25" (63cm), with similar amounts estimated across Turnagain Pass. As is often the case, the storm brought much lighter amounts, generally 2 to 4" (5-10cm) to the immediate Anchorage area.
Heavy snow fell in the Bristol Bay region March 6 through 8. King Salmon reported 15.9" (40.4cm) of snow March 7-8th, the fourth highest 2-day total of record. A storm total of 17" (43cm) was reported from Iliamna and 10-12" (28cm) at Levelock.
The average temperature at St. Paul Island in the Pribilofs for March was 33.3°F (0.7°C), making this the warmest March in more than 80 years. The only milder March months were in 1935 and 1937. This was also the second mildest late winter (January through March) season of record, with an average temperature of 32.9°F (0.5°F). Only late winter 1937 was milder, with an average of 33.6°F (0.9°F).
Utqiaġvik (Barrow) recorded a couple of daily record high temperatures in March. On the March 6, the high temperature of 21°F (-6°C) exceeded the previous record of 19°F (-7°C) set in 2003. On the last day of March, the high of 30°F (-1°C) exceeded the previous record of 28°F (-2°C) that had stood since 1936.
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