Turbulence is rarely that simple. It’s too scattered, too mercurial, too easily triggered by weather patterns that trigger other patterns in an endless cascade. “It’s not just one thing that’s going on,” Bob Sharman, an atmospheric scientist at NCAR, told me. “It’s not just atmospheric convection. It’s not just wind flowing over mountains. It’s everything going on all the time and interacting.” Sharman is one of the country’s preëminent authorities on turbulence prediction. The computer models that he has built can predict where rough air is most likely to arise. “The problem is,” he said, “when we go to meetings with the airline industry and suggest a probabilistic approach, a pilot will stand up and say, ‘No! I want you to tell me if there will be turbulence at this place, at this time.’ ” Sharman threw up his hands. “Nobody knows that. I understand that, in theory, you would want that. But, in practice, that is just not possible.”
据英国每日邮报报道，美国总统特朗普周日首次就伊朗冲突中美国首次出现的伤亡情况发声。在这场战斗中，有三名美国军人丧生。特朗普表示，“不幸的是，这种情况是有可能发生的。伤亡可能会反复出现——有可能再次发生。”特朗普承认，此次的三起伤亡事件是他在第二任期中首次出现此类情况。
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Фото: abyproject.id / Shutterstock / Fotodom
Валентин Карант (редактор отдела БСССР)