Snow Delay At The Airport? Blame Planes And Clouds

When planes fly through certain types of clouds, they can trigger a chain reaction that causes precipitation for miles around. As rain or snow falls out of the sky, it can sometimes leave behind a visible hole in the cloud layer ? a hole-punch cloud.

Source: http://www.npr.org/2011/06/30/137521577/snow-delay-at-the-airport-blame-planes-and-clouds?ft=1&f=1007

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