龙卷风简介

简介龙卷风Tornado是在极不稳定天气下由两股空气强烈对流运动而产生的一种伴随着高速旋转的漏斗状云柱的强风涡旋httpbaikebaiducomeditid3945subLemmaId5728655dl1龙卷风外貌奇特它上部是一块乌黑或浓灰的积雨云下部是下垂着的形如大象鼻子httpbaikebaiducomeditid3945subLemmaId5728655dl1的漏斗状云柱风速一般每秒50米至100米有时可达每秒300米由于龙卷风内部空httpbaikebaiducomeditid3945subLemmaId5728655dl1气极为稀薄导致温度急剧降低促使水汽迅速凝结这也是形成漏斗云柱的重要原因httpbaikebaiducomeditid3945subLemmaId5728655dl1httpbaikebaiducomeditid3945subLemmaId5728655dl1由雷暴云底伸展至地面的漏斗状云龙卷产生的强烈的旋httpbaikebaiducomeditid3945subLemmaId5728655dl1httpbaikebaiducomeditid3945subLemmaId5728655dl1风其风力可达12级以上最大可达100米每秒以上一般伴有雷雨有时也伴有冰雹httpbaikebaiducomeditid3945subLemmaId5728655dl1httpbaikebaiducomeditid3945subLemmaId5728655dl1httpbaikebaiducomeditid3945subLemmaId5728655dl1空气绕龙卷的轴快速旋转受龙卷中心气压极度减小的吸引近地面几十米厚的一薄httpbaikebaiducomeditid3945subLemmaId5728655dl1httpbaikebaiducomeditid3945subLemmaId5728655dl1httpbaikebaiducomeditid3945subLemmaId5728655dl1httpbaikebaiducomeditid3945subLemmaId5728655dl1httpbaikebaiducomeditid3945subLemmaId5728655dl1层空气内气流被从四面八方吸入涡旋的底部并随即变为绕轴心向上的涡流龙卷中的httpbaikebaiducomeditid3945subLemmaId5728655dl1httpbaikebaiducomeditid3945subLemmaId5728655dl1httpbaikebaiducomeditid3945subLemmaId5728655dl1风总是气旋性的其中心的气压可以比周围气压低百分之十一般可低至400hPa最低可达200hPa龙卷风具有很大的吸吮作用可把海湖水吸离海湖面形成水柱然后httpbaikebaiducomeditid3945subLemmaId5728655dl1同云相接俗称龙取水