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What are hole punch clouds?

Fallstreak holes make a cloud look like its been used by a hole punch or like a UFO has flown through it.

Have you ever seen a cloud that looks like a hole punch went through it?

The weather phenomenon, called fallstreak holes, occur when supercooled water particles in a cloud fall, leaving behind a circular shaped hole, according to the National Weather Service. 

Supercooled water particles are colder than freezing but have not actually frozen; they freeze after being disturbed by something with ice crystals. Passing aircraft may introduce the ice crystals which start a chain reaction in the cloud as more and more supercooled water particles freeze and fall, making the hole expand. 

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