When 5ers blow over?

FWIW, out here in the SW, most sudden gusts you'll likely encounter in otherwise fairly calm weather, are dust devils. Nasty critters and they sometimes like to sneak down a freeway, parallel to the lanes of travel. When they do that, they don't kick up much dirt, so you can't see them. I was on a full-sized bus that nearly went from the curb lane into the median when we hit one out near Apache Junction on AZ 60 about 20 years ago.

Lyle