Hole-Punch Clouds Made By Jets

“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. EarthSky spoke with Andrew Heymsfield, a senior scientist with the National Center for Atmospheric Research. He led a team that showed a relationship between these strange-looking clouds, jet aircraft and snowfall.” w/ photos

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