小茹加拿大游记(2):白云从何处飘来

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很多人开车从多伦多去美国,一般走QEW高速路。如果天气晴朗,在靠近美国边境的路段从高速路下来,站在比较空旷的地方,或站在东西朝向的大街上,可能会看到一种奇妙的天气现象。一团团的白云从尼亚加拉河畔升起,在高空形成更大的一团团白云,然后被风吹走,接着又有新的白云补充上来往复不断,永不停息。我第一次看到这种天气现象非常感慨,这里简直就像有座巨型的造云工厂,将白云源源不断由地面送上天空。其实这种奇妙的天气现象是由尼亚加拉大瀑布造成的,看下面的视频,其中有一段拍的就是这种大瀑布的造云过程,非常震撼。

为什么加拿大尼亚加拉大瀑布世界闻名?论瀑布的宽度和落差,尼亚加拉大瀑布排在世界第四名,但论流量尼亚加拉大瀑布排世界第一。世界第一的“伊瓜苏瀑布”,流量是1700立方米/秒,世界第二的“维多利亚瀑布”流量是935立方米/秒,而尼亚加拉大瀑布的流量高达2800立方米/秒,比前两位大瀑布流量之和还要多。正是由于巨大流量所具有的能量,加上独特的气候条件,形成了将白云源源不断由地面送上天空的奇特景象。尼亚加拉河很长,两岸很多地方都能看到大瀑布。但是对打算去尼亚加拉大瀑布的朋友来说,在什么时候、什么地点、观赏尼亚加拉大瀑布最精彩?请看详细介绍...

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