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Landspouts and Waterspouts

The landspout looks like a slender tornado over land, but is not associated with an organised rotating cloud, does not form below a wall cloud and is generally not intense enough to do much damage. The mechanism which forms a landspout is similar to the waterspout: relatively cool air passing over hot ground produces updraughts and cumulus clouds. Random swirls can be caught up in an updraught and so tighten up into a funnel which is made visible by raised dust, rather than by condensation of moisture.
A waterspout (Photo) looks like a slender tornado but occurs only over water. They are occasionally seen near the coast in the late summer and autumn. Cool, unstable air masses passing over the warmer waters allow vigorous updraughts to form, which can tighten up into a spinning column. The cool, moist air usually supports a full condensation funnel. Waterspouts can be dangerous for boaters and shoreline locations but are no threat farther inland since they collapse soon after they move onshore.
Source - http://www.bom.gov.au/storm_spotters/handbook/tornadoes_and_other_funnel...