Definition
A colloquial term for a tornado — a violently rotating column of air extending from the base of a thunderstorm cloud (cumulonimbus) down to the ground, capable of producing extreme wind speeds and severe destruction along its path.
Plain English
Another name for a tornado — that narrow, spinning funnel of air that drops out of a thunderstorm and tears across the ground.
Context Anchor
Pilots may hear this word in informal weather reports, news reports, or pilot conversations about severe storms near an airport or route.
Derivation
From the everyday English word 'twist,' referring to the violently twisting, rotating motion of the air column. The informal name describes what the storm visibly does — it twists.
Why Pilots Care
Twisters create extreme wind shear, turbulence, and debris that can destroy an aircraft in seconds.
Grounding Statement
If a spinning funnel from a storm reaches the ground, that is the kind of weather event pilots mean when they say “twister.”
Intuition Check
A twister is not just any turning or swirling wind. In this context, it means a tornado that reaches the ground.
Example Sentence 1
The flight service briefer mentioned a twister had been spotted near the route, so the pilot rerouted well clear of the storm system.
Example Sentence 2
We diverted fifty miles south to stay well clear of the reported twister.