AIR MAIL
Where today’s air came from
The air arriving over Belchertown about 5,000 feet above the ground was over the Atlantic off Florida three days ago, and over New England a day ago, about 1,530 miles back along its path. It came down from about 10,400 feet up, warming and drying as it sank. Near the ground the air came from the North Atlantic; at 10,000 feet, from the Appalachians. Traced back 72 hours through NOAA’s hourly RAP analyses and the GFS beyond them, nine paths at each of three heights.