AIR MAIL
Where today’s air came from
The air arriving over Wilson about 5,000 feet above the ground was over a point about 410 miles to the south three days ago, and over the southern Plains a day ago, about 760 miles back along its path. Most of the nine paths traced from around the city agree. Near the ground the air came from the Great Lakes; at 10,000 feet, from the southern Plains. It has stayed over land, which is why it feels dry. Traced back 72 hours through NOAA’s hourly RAP analyses, nine paths at each of three heights.