Caption:
Mesocyclone thunderstorm. Tornados develop from these intense thunderstorms that begin to spin because high-level winds are blowing faster and in a different direction to low-level winds. The rotation can be enhanced by the interaction of cold and warm air currents, causing a mesocyclone, which is a powerful air column moving upward at the centre of the storm. From this stage, the spin might intensify and a rotating column of air will break through the wall cloud and hit the ground, forming a tornado. Photographed in Colorado, USA.
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