Is essentially a tornado happening over water Often it refers to a small, fairly weak revolving column of air over water underneath a cumulonimbus or towering cumulus cloud
A rapidly rotating column of air extending from a cumulonimbus cloud with a circulation that reaches the surface of the water, (i e a tornado over water)
A small, weak tornado, which is not formed by a storm-scale rotation It is generally weaker than a supercell tornado and is not associated with a wall cloud or mesocyclone It may be observed beneath cumulonimbus or towering cumulus clouds and is the water equivalent of a landspout
a channel through which water is discharged (especially one used for drainage from the gutters of a roof) a tornado passing over water and picking up a column of water and mist