Tornadoes

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than 300 mph), although speeds of more than 800 km/hr (500 mph) have been estimated for extremely strong storms. Damage to property hit by a tornado results both from these winds and from the extremely reduced pressure in the center of the funnel, which causes structures to explode when they are not sufficiently ventilated to adjust rapidly to the pressure difference. The pressure reduction is in keeping with Bernoulli's principle, which states that pressure is reduced as velocity increases.
are most common and strongest in temperate latitudes, and in the U.S. they tend to form most frequently in the early spring; the Atornado season@ shifts toward later months with increasing latitude. The number of funnels observed each year can vary greatly in any given region.
A cyclone is an area of low atmospheric pressure surrounded by a wind system blowing, in the northern hemisphere, in a counterclockwise direction. A corresponding high-pressure area with clockwise winds is known as an ...

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