A Tornado of Water

7月 23, 2010 · Posted in 未分類 

The seaman distinguishes between waves of two kinds, but there is also a scale of nine degrees, ranging from “calm” to “precipitous sea” (in which the waves are forty feet or more in height) for estimating sea disturbance, and another one, recently adopted by international agreement, for estimating swell. Whenever tropical hurricanes are likely to be about the navigator keeps a lookout for an increase in the swell, which often gives the first warning of one of these storms, as the storm waves travel much faster than the storm itself. Of all atmospheric phenomena observed at sea, the waterspout is probably the most interesting.

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