Definition
A violently rotating column of air extending from the base of a thunderstorm cloud (typically a cumulonimbus) to the ground. Tornadoes contain extremely high wind speeds and very low central pressure, and are associated with severe convective weather, often along squall lines or in supercell thunderstorms. A tornado that does not reach the ground is called a funnel cloud; over water, the same phenomenon is called a waterspout.
Plain English
A spinning column of air that drops down from a thunderstorm and touches the ground, with winds strong enough to destroy almost anything in its path.
Context Anchor
Pilots encounter this term in weather briefings, severe weather forecasts, airport weather warnings, and go/no-go decisions before flight.
Derivation
From the Spanish 'tronada,' meaning thunderstorm, which itself comes from the Latin 'tonare,' meaning to thunder. The word reminds us that tornadoes are products of severe thunderstorms, not standalone weather events.
Why Pilots Care
Tornadoes create hazards far beyond the funnel itself, including violent updrafts, hail, and sudden wind shifts that can destroy aircraft.
Grounding Statement
If a tornado is reported near your departure airport or route, the practical decision is to stay away from that area rather than try to fly around it visually.
Intuition Check
A tornado is not just “very strong wind.” It is a rotating column of air connected to a storm and reaching the ground.
Example Sentence 1
The convective SIGMET warned of severe thunderstorms with the potential for tornadoes along the route, so the pilot diverted well to the south.
Example Sentence 2
Pre-flight weather showed tornado watches along the route, so the crew delayed departure.