The surface based temperature inversion was fairly underwhelming at 3am Tuesday, as shown in the plot on the left: only about 9ºC in 1000 meters. After balloon launch time surface temperatures cooled some more before fairly widespread fog developed. Fairbanks Airport got to 6 below, Woodsmoke PWS 14 below and Goldstream Creek 16 below. Here on Keystone Ridge as of 9 am it's been down to 1 above; as I write this I'm looking at lovely dawn colors in the eastern sky, with the tops of the fog in the valley well below.
