earthstory:

Hydrous tornado over Florida

These vortices of wind and cloud are essentially tornadoes formed over water, though they tend to be less destructive than their land based cousins. They are not always associated with supercell thunderstorms (even a sedate cumulus cloud can be enough), and therefore usually have less energy fueling their formation. They do not usually suck up a column of water, the cloud results from condensation from the rising air as the water evaporates, and the fair weather variety if a phenomenon arising from the complex dynamics of cloud formation.

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