January 3rd, 2008
Tornadoes - How Are They Formed?
Tornadoes are defined as an aggressively rotating column of air which is in contact with both a cloud base and the earth. Tornadoes typically have a visible funnel, with the narrow end touching the surface of the earth.
Most tornadoes have winds of 100mph or less, are approximately 90 meters wide, and travel a few miles before fizzling out. Some tornadoes can have winds of more than 280mph, can be more than a mile across, and stay on the ground for tens of miles.