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Killer weather on Mount Everest

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7:27pm, May 30, 2004

From Montreal, at a joint meeting of the American and Canadian Geophysical Unions

In May 1996, eight climbers attempting to reach the peak of Mount Everest died. An analysis of weather patterns at the time suggests that a sudden drop in barometric pressure may have played a significant role in the tragedy.

During the first week of that month, Mount Everest lay beneath a zone of abnormally high atmospheric pressure, says Kent Moore, a physicist at the University of Toronto. When wind speeds dropped on the evening of May 9, mountaineers from two expeditions left their 8,000-meter-high base camp and headed for the 8,848-m summit. On the afternoon of May 10, a storm with near-hurricane-force winds engulfed the peak and trapped 26 climbers on the slopes.

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