AIR MAIL
Where today’s air came from
The air arriving over Monroe 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 9,200 feet up, warming and drying as it sank. Near the ground the air came from the Atlantic off the Carolinas; at 10,000 feet, from a point about 150 miles to the southeast. Traced back 72 hours through NOAA’s hourly RAP analyses and the GFS beyond them, nine paths at each of three heights.