Sheldon Cooper

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Andrew Heymsfield on hole-punch clouds made by jets

Hole-punch clouds are sometimes reported as UFOs. A scientist talks with EarthSky about the connection between hole-punch clouds, jet aircraft and snowfall.

You might be familiar with contrails, those wispy strands of clouds made by jet exhaust high in the sky. But you might never have seen a hole-punch cloud. They’re very strange clearings in the cloud cover – clear patches of sky, often with a circular shape. Sometimes people report them as UFOs. Some thought airplanes created hole-punch clouds – but just how they did it was unclear.

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(via rapedbyrapture)