PHOTOS: Is it a UFO? Hole punch clouds seen around the Bay Area
This cloud formation is called a fallstreak hole. We also call it a hole punch cloud.
Something, like a plane, travels through the cloud layer and disrupts the pressure and humidity within that layer. This causes the super-cooled water and ice crystals to evaporate and sublimate as they fall from the cloudy layer. This creates the brush-like streaks you see below it.
As the moisture falls it leaves dry air behind which produces the hole, and in some cases, an elliptical opening in the cloud deck.
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Strange clouds ☁️ with the goats 🐐 pic.twitter.com/lHwrXwqYcz— Mandy (@MandyTranRealto) September 15, 2018