A small, intense vortex inside a tornado linked to narrow streaks of extreme damage is a suction vortex.
Suction vortices, also called suction spots, are smaller subvortices embedded within a larger tornado circulation. They commonly occur near the tornado’s base, where the tornado interacts with the ground. As air converges inward and rises, the flow can break into several concentrated rotating cores rather than remaining a single smooth vortex.
These vortices are often associated with multiple-vortex tornadoes. They may briefly intensify, orbit the main circulation, merge, or dissipate. When one passes over a narrow strip of land, it can create a sharply defined streak of catastrophic damage immediately beside areas with much less destruction. This explains why tornado damage paths can contain abrupt, alternating bands of severity.
The term does not mean that a suction vortex “sucks” objects upward by itself; it describes concentrated inflow and rotation within the tornado. A landspout and a dust devil are different types of vortices, while a gustnado forms along a gust front and is not an internal tornado subvortex.