It's the sounding everyone has been waiting for! We recorded the lowest 850mb temperature observed at GYX tonight of -35.5C. While we can't definitively say whether or not Mt Washington was in the stratosphere, the tropopause started just below the summit. #NHwx #MEwx # pic.twitter.com/adlCdaEToj

— NWS Gray (@NWSGray) February 4, 2023