A non-supercell tornado that forms along a gust front or similar boundary is called a landspout.
Landspouts develop without the organized rotating updraft, or mesocyclone, characteristic of a supercell. Instead, wind shear and convergence near the ground create horizontal or weak vertical spin. A growing cumulus or cumulonimbus updraft then stretches that rotation upward, tightening it into a tornado connected to both the cloud base and the surface.
The term “landspout” was coined by atmospheric scientist Howard B. Bluestein in 1985. These tornadoes are often narrow, rope-like, and short-lived, and they commonly occur beneath developing, high-based thunderstorms. Their weak radar signature makes them difficult for forecasters to detect remotely.
Landspouts are often confused with gustnadoes. A gustnado is a shallow eddy in thunderstorm outflow along a gust front and generally has no connection to the cloud base, so meteorologists usually do not classify it as a true tornado. A dust devil is unrelated to a thunderstorm, while a waterspout is the corresponding tornado over water.