I caught this dust devil while we were coming back from Joshua Tree National Park yesterday. We were on the western end of I-10 driving about 80 mph (speed limit is 75 mph). I guess all my years of taking pictures from a moving car have paid off! Not to mention a little help from Aperture to correct for the tinted window… and Topaz Clarity.
A dust devil, like a tornado, is a weather phenomenon. Dust devils form as a swirling updraft under sunny conditions during fair weather, rarely coming close to the intensity of a tornado. According to Wikipedia, certain conditions increase the likelihood of dust devil formation: