From Glossary of Meteorology
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  1. (Rare.) A tornado.

  2. Colloquial expression describing tornadoes occurring with a parent cloud in its growth stage and with its vorticity originating in the boundary layer.

    The parent cloud does not contain a preexisting midlevel mesocyclone. The landspout was so named because it looks like a weak, Florida Keys waterspout over land.
    See nonsupercell tornado.

    Bluestein, H. B. 1985. The formation of a “landspout” in a “broken-line” squall line in Oklahoma. Preprints, 14th Conf. on Severe Local Storms. Indianapolis, . 267–270.