AIR MAIL
Where today’s air came from
The air arriving over Hawk Creek about 5,000 feet above the ground was over the western Gulf of Mexico three days ago, and over Texas a day ago, about 1,350 miles back along its path. It rose from near the ground on the way. Near the ground the air came from the Ohio Valley; at 10,000 feet, from the Ozarks. Air off the water carries moisture, which is why it feels humid. Traced back 72 hours through NOAA’s hourly RAP analyses, nine paths at each of three heights.