I’m blown away. (And might be literally, were I standing on Mars).
It’s late spring on Mars. According to scientists with the HiRISE experiment that captured the image, the length of the shadow indicates that the dust plume reaches more than 800 meters, or half a mile, in height.
The arc in the plume was produced by a westerly breeze at about 800 feet that blew the top of the plume towards the east. The dust plume itself is about 100 feet across.
Dust devils are not tornadoes. They usually form on a clear day when the ground is heated by the sun, warming the air just above the ground. This can begin to rotate if it rises fast enough and encounters cooler air above it.