A landspout is a term coined by meteorologist
Howard B. Bluestein in 1985 for a kind of
tornado not associated with a
 The Glossary of Meteorology defines a landspout as
- "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 mid-level mesocyclone. The landspout was so named because it looks like "a weak
waterspout over land."
Landspouts form during the growth stage of a
cumulus congestus cloud by stretching
vorticity upward and into the
cumulus congestus's updraft. They generally are smaller and weaker than
supercell tornadoes and do not form from a
mesocyclone or pre-existing rotation in the cloud. Because of this, landspouts are rarely detected by
Doppler weather radar.
Landspouts share a strong resemblance and development process to that of
waterspouts, usually taking the form of a translucent and highly
laminar helical tube. Landspouts are considered tornadoes since a rotating column of air is in contact with both the surface and a cumuliform cloud. Not all landspouts are visible, and many are first sighted as debris swirling at the surface before eventually filling in with condensation and dust.
A few landspouts can persist in excess of 15 minutes and have produced
 however, they rarely produce damage greater than EF-2.