Tilmon, Wallace and Shook all raised the prospect of air turbulence, which airplanes can encounter without warning.

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This may create enough air turbulence to push a viral particle from landing on your face and mucous membranes.

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As a car prepares to overtake, the air turbulence of the wake from the car ahead interferes with the downforce of the overtaker.

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The crew of Air France Flight 447 reported severe turbulence shortly before the plane disappeared.

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These are a result of increased turbulence and entrainment of air at higher altitudes by the simulated turbines.

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Experts said protrusions on the otherwise smooth belly of the shuttle could disturb the air flow during re-entry, causing turbulence that raises temperatures on heatshield tiles downstream.

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They found that gravity waves "break" on the surfaces of planes, just like ocean waves breaking on the beach, causing much of the turbulence that occurs out of the blue in clear air.

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Air France has said that Flight AF 447 sent an automatic signal indicating electrical problems while going through strong turbulence early in its 11-hour flight from Rio de Janeiro to Charles de Gaulle airport in Paris.

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