3 Answers

The Coriolis force is part of the reason that

hurricanes in the Northern Hemisphere rotate

counterclockwise. If the Earth didn’t spin, we

would have wicked 300 mph winds from the

tropics to the poles and back again. The Earth

does spin however, and in the mid-latitudes, the

Coriolis force causes the wind—and other

things—to veer to the right. It is responsible for

the rotation of hurricanes.

Source >>>http://littleshop.physics.colostate.edu/activities/atmos1/HurricanesGoCounterclockwise.pdf

They don't. They rotate in opposite directions in the northern and southern hemispheres.

Coriolis effect       en.wikipedia.org/wiki/Coriolis_effect‎

I consider the Coriolis effect one of the more interesting facts that can be easily demonstrated and explained over a broad range of effects that occur globally. Although our observations and relational pattern recognition of this effect is high, there are many mysteries that are not approprately linked to this influence. A mountain in N.California is slowly rotating as a result of this effect and the geology of the region.