Dust Devil in Syria Planum (GIF-Movie)

Caption NASA:"On 1 August 1978, the two cameras of the Viking 1 Orbiter's Imaging System acquired overlapping pictures of a Region in between Syria and Sinai Planum that showed a light-toned columnar feature casting a shadow toward the South-East (lower right). The two images, 755A10 and 755A11, were obtained just 15" apart from each other.
During that time, the bright feature and its shadow changed. The feature was a Dust Devil, and the Viking cameras caught it in motion.

Nearly three decades later, the MGS-MOC acquired an image on 22 March 2005 of the area, with the ephemeral Dust Devil long, long gone. During the 15" interval between the two Viking 1 images, the Dust Devil moved toward the North-East (upper right) at a rate of about 18 mt (about 59 feet) per second. Sunlight illuminates all of the images from the upper left; North is up".