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北京上空周四上午出现了粉红“UFO”，气象局官宣是飞碟云。不少网友惊呼“UFO！”、“看到这样一团粉色棉花糖，心都甜化了！”

北京市气象局官方微博气象北京指出，天空出现形似飞碟的云团，主要是上升气流与下沉气流共同影响形成的高积云，常为中间厚边缘薄，形似豆荚，又叫荚状云或者碟状云。

北京青年报报道，中国气象局气象工程师卞赟指出，荚状高积云通常只在升降气流的会合处，上升气流冷却后遇到下沉气流，云体就不会继续上升，边缘便因蒸发而逐渐变薄形成荚状。

民间谚语称“天上鱼荚，找水泡茶”，表明莱状高积云对天气有很好的指示性。卞赟指出，荚状高积云若配合暖湿气流活动，云层逐步加厚，就有可能出现阴天甚至降水的情况。

不过，北京今晨受到冷空气的影响，风力较大，干冷的空气袭来，这样局部的云团起不了太大的作用，今明两天，北京以晴天为主。