AIR MAIL
Where today’s air came from
The air arriving over Baker about 5,000 feet above the ground was over the Mojave Desert three days ago, and over the northern Rockies a day ago, about 1,260 miles back along its path. Most of the nine paths traced from around the city agree. It came down from about 9,200 feet up, warming and drying as it sank. Near the ground the air came from the Ozarks; at 10,000 feet, from the desert Southwest. Traced back 72 hours through NOAA’s hourly RAP analyses, nine paths at each of three heights.