Dust devil is moving to the upper left, leaving a dark track to the lower right.
The primary flow is circular around the vertical axis of the tornado or dust devil.
Consequently, near the center of the tornado or dust devil the air pressure is low.
When a dust devil goes by it blows away the coating of dust and exposes the underlying dark surface.
A dust devil, fully formed, is a funnel-like chimney through which hot air moves, both upwards and in a circle.
While being flown by another pilot, the plane encountered a dust devil on final approach.
Click on image to see more details: dark dunes, beautiful dust devil tracks, and boulders (small bright dots).
Click on image to see changes in dust devil tracks in just 3 months.
