科技资讯:揭秘＂暴风雨前的宁静＂

  本文摘要：have you ever spent an afternoon in The backyard，maybe grilling or enjoying a basketball game，when suddenly you notice that everything goee and suddenly a line of clouds ominously appears on the horizon clouds with a look that tells you th

have you ever spent an afternoon in The backyard，maybe grilling or enjoying a basketball game，when suddenly you notice that everything goee and suddenly a line of clouds ominously appears on the horizon clouds with a look that tells you they arent fooling around . you quickly dash in the he Se ase 突然乌云经常出现在地平线上，有不祥预感的乌云的样子告诉你不仅仅是形状。(大卫亚设，Northern Exposure(美国电视连续剧)，季节名言)你急忙跑进屋里，在大雨倾盆之前，差点直接扔进废弃的大雨滴里。

在这个时候，你可能不会停止：暴风雨来之前为什么那么安静？its an intriguing phenomenon that people have recognized for centuries，but what on earth causes this calm？and there is an old phrase calm before the storm，Often used in its figurative meaninga quiet period just before a great activity or excitement . accessand is it always calm before the storm？letshear What Scientists Have to say。人们从几个世纪前就发现了这个谜的现象，但究竟是什么原因导致了暴风雨前的这种平静呢？古谚有云暴风雨前的宁静，这一般用来叙述比喻的事变中繁华的活动和情绪变得烦躁前的安静时间。

根据自己的经验，我们说其实暴风雨来之前也很安静。但是这是什么原因呢？暴风雨前总是安静吗？让我给大家讲一讲科学家们的解释。

The answer is sometimes there issome times there isnt . under the right conditions，An eerie or peaceful calm will befall your picnic before a storm moves in。other storms skip the calm and proudly announce their presence by instant在某些情况下，暴风雨来临前经常出现不安或和平的平静，野餐时复活。其他种类的暴风雨要跳过安静的阶段。

就像骄傲地宣布自己的存在一样，顷刻间风雨交加。(威廉莎士比亚，哈姆雷特，骄傲)A Period of Calm Happens in A Particular Kind of Storm，The Simplest Kind of Storma Single-cell Thunder Storm . in this tysstorms need warm and moist air as fuud So they typically draw that air in from surrounding environment . storms can draw in the air that fit their need froom安静的时期往往出现在特定的暴风雨中，即最简单的暴风雨单细胞雷暴中。在这种类型的雷暴中，通常只有一个主要下降气流，即温暖潮湿的气流从地面升起。寒冷湿润的空气是暴风雨构成的必要条件，所以一般不会从周围环境中吸收。

雷雨要从周围的任何方向吸引自己需要的温暖潮湿的空气。甚至雷暴运动方向的空气也被吸入。As the warm，moist air is pulled into a storm system，It leaves a low-pressure vacum in its wake . the rising air meets the cold dry air that has as由于温暖的潮湿空气被雷暴拖来，雷雨过后的地方构成了低压真空带。

正在下降的温暖潮湿的气流遇到雷云中原来不存在的潮湿冷空气时，这时热空气的温度上升，里面的水分凝结成小水滴，这是构成雨水的前提。这些水滴很大程度上是满的，覆盖着灰尘这样的大颗粒，水滴聚集得足够大，就不会形成雨。This warm，moist air keeps moving upwards，But it becomes colder and drier during its trip through cloud which involves cooling and condensas the air descends drawn back toward lower altitudes by the very vacum its departure created in the first place . warm And dry air is relatively stable And 这气流不超过大铁砧形状的雷雨云。

这时气流开始被自己上升时形成的真空带下沉到低处。干燥的气流比较平稳。一旦覆盖一个地区，该地区的气流就不稳定，导致暴风雨前的安静。Most thunderstorms，though，Dont start with a calm . thats because most are actually clusters of storms with complex wind patterns . theres ss尽管如此，在大部分雷雨来临之前并不安静。

因为大部分是风向简单的暴风雨团。暴风雨团周围空气流动频繁，在这种类型的暴风雨到来之前没有什么可安静的。

无视，这种类型的暴风雨来之前，狂风往往不会刮得很大。

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