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The sky is full of mysteries, and one of them appeared over Wisconsin yesterday. "I live in Stevens Point on the University of Wisconsin campus, and I saw some very strange clouds," reports Samantha Weise who took this picture:
More images: #1, #2, #3, #4, #5, #6, #7
These are "hole punch clouds," and no one is certain what they are. One theory holds that hole punch clouds are formed by jet airplanes punching through a cirrocumulous cloud deck. When the jet pierces the cloud, supercooled water droplets in the cloud suddenly crystallize. This water-to-ice transformation proceeds outward from the point of impact, creating a vast circle of icy wisps--the "hole." But how many jets would it take to create this display?