Why There is Circular Motion in Tornado and Twisters?

Question

Tornado and Twisters Hit

http://news.yahoo.com/s/ap/20080512/ap_on_re_us/severe_weather;_ylt=AuN8FToko6NMbdlvnJ6dsjhvzwcF

Answer 1

There are three key "ingredients" for tornado formation; moisture in the lower levels of the atmosphere, unstable air, and a lifting force. The most common lifting force is simply the heating of air near the ground. As the air travels higher into the atmosphere it meets cooler air which can cause it to sink. On a hot, humid day, moist air will rise until it reaches cool, dry air. The moisture will begin to condense and form a cloud. The unstable air "feeds" cloud formation and creates a thunderstorm. I so just looked all that up

Answer 2

It is due to the Earth's rotation, and is called the "Coriolis Effect".   Google "tornado coriolis effect" to learn more.

Here's a link with more information.

http://www.physics.ubc.ca/~kotlicki/Phys...

Here's a quote from that link answering your question.

Hurricanes form in the tropics where the water and air are warm and moist.

A low pressure area forms over a large warm water area. Warm air rises quickly due to heat and low pressure. A vacuum forms, and to replace the rising air, more air is drawn to the centre and then is curved due to the Coriolis Effect giving a circular rotation. Surface friction also causes the wind around the low to spiral toward the center. This rising air, which is saturated with water, cools and condenses to form clouds. The latent heat given off when the water condenses causes the upper air to warm and increase in pressure. This high pressure area is the reason why it is calm the eye of a hurricane. This feedback mechanism continues to intensify as long as there is warm water from which to draw energy. Once a hurricane moves over land, the large energy supply from the ocean is no longer available and the feedback no longer intensifies the storm. As it continues over land it begins to lose strength and eventually dissipates.