Word: shear
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Dates: during 1990-1999
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...collision between warm and cold air masses sets up conditions that favor the growth of big thunderstorms. A tornado, however, requires something else as well: the presence of what meteorologists call wind shear. This occurs when winds in the so-called boundary layer--the part of the atmosphere closest to earth--blow more gently than winds at higher elevations. These two wind streams push on the layer of air that lies between them as though it were an invisible rolling pin. Then, as the warm updraft that powers a supercell shoots toward the stratosphere, it tilts the rolling...
...reach the rudder pedals to fly an airplane across the country in a misbegotten publicity stunt--as long as a licensed pilot was beside her. At week's end a federal investigator suggested that Jessica's Cessna was overloaded for the thin Rocky Mountain air and wind shear may have induced the flight instructor to take over the controls in the plane's last few moments...
...pilot is the person responsible for evaluating the weather conditions and determining whether to go," says airport manager Jerry Olson. The weather conditions were VFR--visual-flight rules--meaning instruments were not required, although another plane warned the control tower of wind shear. Jessica spoke to her mother on a cellphone as the plane was taxiing. "Mom, do you hear the rain...
...Shear Madness. Ongoing. CharlesPlayhouse, Warrenton St., Boston...
...Shear Madness. Ongoing. CharlesPlayhouse, Warrenton St., Boston...