close watch: Clouds and their shadows on Mars, photographed 5 times by Mars Express, 12th September 2010.
At 38°S, 27°E, on the northeast plains of Noachis Terra. This gif covers about one minute of real time. For scale, the larger crater is 35km across; I particularly like the little puffball of cloud that moves across it.
The contrast of landscape flickers slightly because the images are taken sequentially through different filters, intended to be combined into a single colour image.
Image credit: ESA. Animation: AgeOfDestruction.