What is Mesocyclone?
In a severe storm, with a swirling motion in its left rear quadrant, a vertically rotating column of air, often seen with a funnel cloud or tornado cloud beneath it and detectable on Doppler radar.
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The lowest level of a given cloud or cloud layer in the atmosphere, relative to the observer's position above the ground.
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A type of low-altitude cloud that forms in uniform layers, often covering the entire sky and producing overcast conditions.

