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Does horizontal movement of a tornado along the ground detract from the rotational forces present within the vortex i.e. cause the axial rotation of the system to decelerate?

The dynamics of tornados are not well understood (and that is an understatement), so a yes/no answer is not possible. Hurricanes are much better understood and in the case of hurricanes, fast horizontal motion usually means a reduction in rotational motion. Hurricanes behave differently, sometimes very differently. For example, in rare cases horizontal tornados have been observed.

Vince Calder

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