There are a few factors necessary for tornado formation including abundant low level moisture and a “trigger” such as a cold front, to lift the moisture. Once the air is lifted, it will continue to rise and become saturated which creates a storm cloud if the atmosphere is unstable. An unstable atmosphere is characterized by dramatic temperature decreases in increases in elevation. A tornado will form if these conditions combine with high speed winds blowing in variable directions throughout every level of the atmosphere that usually create a funnel shape which spins clockwise. This phenomenon can happen on land as well as in water, creating water spouts.
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