The power of no clouds in mid-winter: Fairbanks airport temperature has dropped 23F (-13C) in less 5 hours Monday morning after hardly changing all weekend. There's no weather front or airmass change at all. Only difference is blanket of clouds went "poof" and now the air right above the snowpack is rapidly losing heat to outer space and cold air is draining toward lower elevations like the Tanana River. #akwx #winter @[email protected] @Climatologist49