Kotzebue Sound is visible in the lower left and the Yukon River in the lower right; darker shades are colder, so unfrozen ocean, lakes, and rivers appear white. Interestingly, the Brooks Range river valleys were warmer than the high terrain this morning, which I assume must be because the valley bottoms are snow-free, while most of the higher terrain is snow-covered. However, an exception to this is seen near Ivotuk, as some of the high-elevation valleys just to the southeast of Ivotuk were very cold.
The table below shows the five-minute temperature observations from the Ivotuk CRN station since midnight local time.
[Update: it appears there is no credible historical report of a temperature this low so early in the season in Alaska. More investigation might be warranted to confirm this. I expect the Ivotuk station will set many new records of this sort in coming years.]
