AIR MAIL
Where today’s air came from
The air arriving over Hegne about 5,000 feet above the ground was over a point about 610 miles to the south three days ago, and over the central Plains a day ago, about 1,020 miles back along its path. Most of the nine paths traced from around the city agree. It rose from near the ground on the way. Near the ground the air came from a point about 910 miles to the south; at 10,000 feet, from the Great Basin. It feels humid. Traced back 72 hours through NOAA’s hourly RAP analyses, nine paths at each of three heights.