Hazard Analysis 2.
Tornadoes are the most erratic, unpredictable, and violent of natures storms.
The destructive power of a tornado is due to the combined action of its strong rotary winds and the partial vacuum in the center of its vortex. Tornadoes are violently whirling wind, characteristically accompanied by a funnel-shaped cloud extending from a cumulonimbus cloud. A tornado can be from a few yards to about a mile wide where it touches the ground, with an average width of a few hundred yards. It can move slowly or speed along at more than 60 mph and may travel for distances ranging from short hops to several miles, causing extensive damage. The funnel is made visible by the dust that it sucks up and by condensation of water droplets in its center.