The essential atmospheric condition for the occurrence of tornados are cool, dry air at middle levels in the troposphere superimposed over a layer of moist, conditionally unstable air near the surface.
A tornado is a violently rotating column of air that collides with both the Earth's surface and a cumulonimbus cloud. Tornadoes come in a variety of shapes and sizes, and they are frequently visible as a condensationfunnel originating from the base of a cumulonimbus cloud, with a cloud of rotating debris and dust beneath it.
Instability - warm moist air near the ground with cooler dry air aloft , and wind shear - a change in wind speed or direction with height are the key atmospheric ingredients that lead to tornado. An unstable airmass promotes the development of strong updrafts, while wind shear further increase the strength of the updraft, and promotes the rotation from which tornadoes are produced.
Therefore, the above-mentioned atmospheric conditions in a specific region predict the occurrence of a tornado.
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Answer:
Tornado-generating storms need very specific conditions to form — moisture, temperature, and something known as wind shear, where the wind changes in strength and direction with height. The atmosphere also needs to be "unstable" — a term that indicates that if you give a bubble of air a shove, it'll accelerate upward.
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