What Does World Wind Mean

How powerful is a whirlwind?

In moderately strong vortices, wind speeds of 40 km per hour (25 miles per hour) flowing around the centre of rotation have been measured and are probably common. Velocities of more than 80 km per hour (50 miles per hour) probably occur in some of the larger, more vigorous dust devils.

What are little whirlwinds called?

Dust devils are an interesting phenomena. Dust devils form in an upward motion from the ground to the sky. They are short-lived whirlwinds that are mainly harmless. Dust devils form when hot air at the surface begins to rise rapidly with much cooler air above it and higher up into the atmosphere.