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“People were dying and we didn’t know why,” Cornman told me. “We didn’t understand the physics of why the planes were crashing.” The deadly gusts were thought to be blowing in from the ocean or from thunderstorms outside the airports. But the danger turned out to be right above them. In the late seventies, researchers at NCAR and the University of Chicago discovered that the crashes were caused by microbursts—sudden, violent downdrafts. In a microburst, a storm cloud dumps cool air and rain straight down, like water from a broken awning. The air spreads horizontally after it lands, so the pilot thinks he’s flying into a headwind at first. He lifts the plane’s nose slightly and decreases the engines’ thrust. Then the downdraft hits, followed by a vicious tailwind, sending the aircraft to the ground.
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长风破浪，行稳致远。5年来，以习近平同志为核心的党中央洞察时与势、辨析危与机，统筹中华民族伟大复兴战略全局和世界百年未有之大变局，带领全党全国各族人民迎难而上、砥砺前行，“十四五”实现圆满收官。。业内人士推荐体育直播作为进阶阅读