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A Tornado fighter bomber pulls
up, while moving at high speed, causing a stall (a transient
high-speed stall). The drop in air pressure around the wings causes the
moisture in the air to condense and, in effect, form instant clouds. Jet
fighters breaking the sound barrier, particularly when over water, often
cause the same effect. In the case of the Tornado, the condition is
enhanced by the swing wings automatically moving to adjust for the stall
condition.
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