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B) Changes in atmospheric pressure.

Tornadoes usually occur along cold fronts in conjunction with a severe thunderstorm and in the presence of cumulonimbus clouds. Cumulonimbus clouds are the tallest clouds that form in the Earth's atmosphere and are necessary for the formation of a tornado.

Tornadoes result from significant differences in atmospheric pressure over very short distances. High winds within cumulonimbus clouds can develop into a vortex, or rotating column of air. Air pressures within a vortex are much lower than air pressure outside the vortex (and air automatically moves from areas of high pressure to areas of low pressure). This rapid movement of air causes debris (houses, trailers, trees, cars, dirt, people, cows) to be pulled into the center of the vortex and carried away as the tornado advances. When people, animals and other objects are found some distance away from their point of origin, it is because they have been lifted, transported and then dropped by violent winds of the vortex. Tornadoes that have not touched down on the ground are called funnel clouds. Wind speeds inside a tornado can reach above 300mph!

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