Word: shear
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...After college, you didn't take anything for granted," said Michael Shear '71, a Crimson editor and former classics concentrator...
Gryk recalled his history and literature tutorials turning into protest meetings, where Shear said section discussion generally moved beyond the syllabi and became preoccupied with the contemporary political unrest...
Every time a commercial airliner meets up with disaster, the flying public is forced to confront dangers it never even knew existed--remember microbursts and wind shear?--and the airlines scramble to alter policies, upgrade technology or retrain their pilots. In the case of the May 11 crash of ValuJet Flight 592, which plunged into the muck of the Everglades and killed all 110 people on board, the safety concerns are so varied--and the questions emerging about the role of the Federal Aviation Administration in regulating low-cost airlines so troubling--that it may be a while before passengers...
...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...
...happening. But while scientists agree that the updraft is essential, many doubt that it provides the sole mechanism for tornado formation. Some scientists think the rapid sinking of colder, dryer air near the rear flank of the storm may be key. If this rush of air encounters wind shear on its way down, then it too will start to rotate. In this scenario, a tornado occurs as air from the downdraft nears the ground, swoops out horizontally and--attracted by the zone of low pressure created by the mesocyclone--spirals back into the storm like smoke curling up a chimney...