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Tornadoes are more common in April, May, and June than in February or March. The two most fundamental ingredients needed for making tornadoes are instability and wind shear. Instability occurs when the lower atmosphere is warm and moist and cools quickly with increasing height. Instability allows thunderstorms to form. Wind shear occurs when the speed and direction of wind changes with altitude.

Wind shear tends to be strongest in winter and weakest in summer, while the opposite is true of instability. The most ideal combination of wind shear and instability generally occurs in the spring.

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