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{{B}}Weather and forecast{{/B}}

Many of the most damaging and life-threatening types of weather-torrential rains, severe thunderstorm, and tornadoes-begin quickly, strike suddenly, and dissipate (消散) rapidly, devastating (毁坏) small regions while leaving neighboring areas untouched. One such event, a tornado, struck the north-eastern section of Edmonton Alberta, in July 1987. Total damages from the tornado exceeded $250 million, the highest ever for any Canadian storm. Conventional computer models of the atmosphere have limited value in predicting short-lived local storms like the Edmonton tornado, because the available weather data are generally not detailed enough to allow computers to discern the subtle atmospheric changes that precede these storms. In most nations, for example, weather-balloon observations are taken just once every twelve hours at locations typically separated by

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