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No, they can form over water. At that point it is called a tornadic waterspout.
Waterspouts occur when a tornado develops over water or moves to water after forming on land. The three types of waterspout are tornadic, non-tornadic and snowspout.
If the winds associated with it reach the surface, it is called a waterspout.
A tornado that forms on a lake or sea is called a waterspout.
A tornado on water is called a waterspout.
A tornadic thunderstorm is most likely to develop over the Great Plains.
Wind causes most of the damage associated with tornadoes. In rare cases, tornadic winds can reach over 300 mph.
It's a waterspout.
A tornado over water is called a waterspout.
A waterspout.
A tornado over a body of water is called a waterspout.
A waterspout can transition from water to land but becomes a tornado as long as it is touching land; if it is not touching the ground it would be called a "funnel cloud".