Question

What causes turbulence and is it dangerous?

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Answer

Turbulence is irregular air movement, and for the aircraft it is almost never dangerous. For unrestrained passengers and crew it occasionally is, which is the entire reason for the seatbelt sign.

There are several sources.

Convective turbulence comes from rising warm air, common over land on hot afternoons and around thunderstorms.

Mechanical turbulence is air disturbed by terrain — flying near mountains produces it reliably.

Wake turbulence is the vortex left behind another aircraft, which is why air traffic control spaces departures.

Clear air turbulence is the one that catches people out. It occurs near jet streams at cruising altitude with no cloud and no radar signature, which is why it can arrive without warning.

Aircraft are built with very large margins. Wings are designed to flex — that visible movement is the structure working as intended, not straining — and certification requires them to withstand loads far beyond anything turbulence produces. Structural failure from turbulence in a modern airliner is essentially unheard of.

The real risk is injury inside the cabin. Almost everyone hurt in a turbulence event is someone not wearing a seatbelt, or a crew member working. That is why the advice is simply to keep your belt loosely fastened whenever seated, even when the sign is off.

Pilots avoid what they can see and receive reports of what they cannot. Rougher air is uncomfortable rather than hazardous, and the aircraft is not "dropping" — the sensation of falling is usually a few feet of altitude change.

Sitting over the wing, near the aircraft's centre of gravity, gives the smoothest ride.

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