Knowra Landspout Landspout A typically weak tornado formed when a developing thunderstorm’s updraft stretches preexisting near-surface rotation upward. Unlike a classic supercell tornado, it forms without a mesocyclone.
Vertical vorticity : The local spinning motion of air around a vertical axis. Landspouts intensify when an updraft stretches preexisting vertical spin.
Supercell tornado : A tornado produced by a supercell thunderstorm, typically from its rotating mesocyclone. It forms through a storm-scale rotating updraft, unlike a landspout.
Howard B. Bluestein : An American meteorologist known for research on severe storms and tornadoes. Bluestein helped establish landspout as a distinct tornado type in meteorological usage.
Colorado landspouts : Landspouts observed on Colorado’s plains, often near boundaries between converging airflows. The region’s dry environment and frequent convergence boundaries favor visible examples.
Vortex stretching : The intensification of rotation when a fluid column is stretched along its axis. The developing updraft stretches near-surface rotation into a tornado.
Waterspout : A rotating column of air over water, either fair-weather or associated with a thunderstorm. A landspout is the comparable non-mesocyclonic tornado over land.
Tornado classification : The grouping of tornadoes by their formation, structure, intensity, or observed characteristics. Landspouts are classified by their non-mesocyclonic formation.
Florida landspouts : Landspouts observed in Florida, where thunderstorms can develop over sea-breeze boundaries. Sea-breeze convergence provides a recurring setting for landspout formation.
Boundary layer : The lowest part of the atmosphere, directly influenced by Earth’s surface. The rotation that seeds a landspout is already present near the ground.
Gustnado : A short-lived vortex that forms along a thunderstorm’s gust front and is not a tornado. Its storm association can resemble a landspout, but it lacks a tornado’s connection to the cloud base.
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