The coldest area last week was the north-central interior, with the Norutak Lake RAWS reaching -40° or colder for 8 consecutive days ending yesterday. The coldest conditions have now shifted to the northeast, with the Chalkyitsik RAWS sitting at -48°F this evening and apparently on track to break -50°F tonight. Last winter no station in Alaska quite reached -50°F, although the Kanuti Lake RAWS got very close.
Environment Canada's surface chart from yesterday afternoon showed strong high pressure over northeastern Alaska, and the Fairbanks sounding measured a cold column with 850mb temperatures well below -20°C. However, strong warming has been occurring aloft in the past 24 hours as the high pressure produces subsidence; note the difference between the two soundings below (3pm yesterday and 3pm today).
The 1.5-meter temperature measurements from UAF's Poker Flat Research Range show the warm-up nicely; this morning the temperature jumped from -28°F to -7°F in only half an hour. The Poker Flat site is located near Chatanika on the Steese Highway north of Fairbanks at an elevation of about 700 feet above sea level.