AIR MAIL
Where today’s air came from
The air arriving over Tordenskjold about 5,000 feet above the ground was over a point about 890 miles to the south three days ago, and over the southern Plains a day ago, about 1,240 miles back along its path. It rose from near the ground on the way. Near the ground the air came from the Ozarks; at 10,000 feet, from the southern Rockies. It feels humid. Traced back 72 hours through NOAA’s hourly RAP analyses, nine paths at each of three heights.