Word: grounds
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Dates: during 1990-1999
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...when the telescope is completed, it will be one of the most useful astronomical instruments in the world, according to Kirshner. He says the first mirror is cast and ready to be ground and polished at the University of Arizona...
FOND DU LAC, Wisconsin: Seeking to retake the high ground on welfare reform from President Clinton, Bob Dole on Tuesday endorsed a five-year time limit on welfare benefits and said states should have the option of requiring mandatory drug testing for welfare recipients. Dole said welfare and other Great Society programs represent the failures of liberalism: "Today, it stands as its greatest shame; a grand failure that has crushed the spirit, destroyed the families and decimated the culture of those who have become enmeshed in its web." Clinton had launched a preemptive strike on Saturday when he announced...
Storm chasing as an organized enterprise began in 1972, when the Tornado Intercept Project was launched to provide what radar meteorologists refer to as "ground truth." At the time, the NSSL was developing a radar capable of detecting areas of strong rotation inside big tornado-producing storms. The chasers provided visual proof that particular radar signatures did indeed precede the formation of tornadoes. The new radar, Doppler radar, made use of the fact that radio waves shift frequency depending on whether the objects they bounce off are advancing or receding. In this case, the objects that create the Doppler shift...
...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...
...possibility, says UCLA meteorologist Roger Wakimoto, is that the tornadoes typical of supercell storms are formed by the same mechanism that creates the smaller, less destructive funnel clouds known as waterspouts, landspouts and dust devils. These twisters all build their vortexes not from the clouds down but from the ground up. They are triggered, Wakimoto says, by low-lying eddies of air that are perturbed by a fast-moving front or some other local disturbance. When a supercell storm passes over such an area, swirling air near the ground could easily be sucked into the updraft and spun up into...