Paul,
It is a condition that occurs far to the west of Camelot, er, Kansas!
. Technically speaking, it is the opposite of the air in Kansas, as it is lighter and less dense, so it rises above the humidity! And therefore is dryer!! In fact, it is so dry, the jackrabbits and rattlesnakes carry canteens, and the coyotes are always trying to steal their water! We can diss cuss this further at MoJam with appropriate beverages!
Hawkdancer