AIR MAIL
Where today’s air came from
The air arriving over Gail Lake about 5,000 feet above the ground was over the southern Rockies three days ago, and over the southern Plains a day ago, about 1,870 miles back along its path. Most of the nine paths traced from around the city agree. It came down from about 11,000 feet up, warming and drying as it sank. Near the ground the air came from the Ozarks; at 10,000 feet, from Texas. Traced back 72 hours through NOAA’s hourly RAP analyses, nine paths at each of three heights.