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(Newser)
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You can not see it coming. The turbulence in the clear, which obviously hit an Air Canada flight over the Pacific Ocean, hits full force, with no visible sign in the sky. The radar of an airplane can not locate it either. When he struck Air Canada, people were hit on the ceiling and more than two dozen were taken to hospitals after an emergency landing in Honolulu. Clear turbulence occurs most often in or near high-elevation rivers, called jets, according to the AP. The culprit is wind shear, which occurs when two huge air masses close to each other move at different speeds. If the difference in speed is large enough, the atmosphere can not support the load and creates turbulence such as swirls in the water. Another source is the air masses that oscillate in the atmosphere, much like waves in the ocean.
They can occur spontaneously or form when the air flowing over the mountains is forced upward, triggering the cycle back and forth. Thomas Guinn, professor of meteorology at the Embry-Riddle Aeronautical University in Daytona Beach, Florida, explains the weather forecast with great clarity. "It's probably one of the most difficult prediction problems we have in aeronautical meteorology today," he said. Paul Williams, of the University of Reading in England, said that some tests suggest that specialized radar-type devices could make atmospheric disturbances visible to pilots. But the devices are expensive and heavy, so they are not widely used. Once the pilots have encountered turbulence, they may try to fly away, possibly by changing altitude, said Clint Balog, also of Embry-Riddle.
(Read more stories of turbulence.)
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