Night-Clouds over Vastitas - Sol 95 (GIF-Movie; credits: NASA/JPL-Caltech/University of Arizona/Texas A&M University )

An angry looking sky is captured in a movie clip consisting of 10 frames taken by the Surface Stereo Imager on NASA's Phoenix Mars Lander.

The clip accelerates the motion. The images were take around 03:00 M.L.T. at the Phoenix Site during Sol 95 (Aug. 30), the 95th Martian day since landing.

The swirling clouds may be moving generally in a Westward direction over the Lander.