Landspout
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A landspout is a type of tornado not associated with a mesocyclone. The term was coined by atmospheric scientist Howard B. Bluestein in 1985. The Glossary of Meteorology defines a landspout as:
A landspout tornado in the early stages of development by the town of Lamar, Colorado
A landspout tornado forms from a developing thunderstorm near Cheyenne Wells, Colorado. Landspouts are exceptionally common in Eastern Colorado.
Landspout on 29 September 2007 in Minas Gerais
Tornado vortex signature
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A tornadic vortex signature, abbreviated TVS, is a Pulse-Doppler radar weather radar detected rotation algorithm that indicates the likely presence of a strong mesocyclone that is in some stage of tor
Typical display of a tornado vortex signature (the downward-pointing triangle near the mesocyclone) on a National Weather Service Doppler weather radar display (here the case of the 1999 Bridge Creek-Moore tornado).