how fast is the wind velocity?
Typical wind speeds in the Martian atmosphere exceed 200 km/hr (or 125 miles/hr). Gusts can often reach 500 to 600 km/hr (or 300-375 miles/hr). Typical Wind speeds at the surface during a dust storm, as measured by the Viking landers, are typically about 30 m/sec (or 67.5 miles/hr). .