We have already studied a lot of unusual phenomena in the clouds with you. Well, here, for example, are Upper-like clouds, and here are no less beautiful Lenticular clouds. See also the Morning Gloria and the Pyramidal Clouds.
And this rare effect can be seen in cirrocumulus clouds - a large circular rip called Fallstreak. Holes in the clouds are caused by falling ice crystals.
Ice crystals can form in higher clouds or in the exhaust of a passing aircraft. If the air is at the right temperature and humidity, the falling crystals will absorb water from the air and grow.
For this to happen, the water must be so cold that it only needs a suitable surface to freeze. Loss of moisture in the air increases the rate at which the water droplets in the cloud evaporate and they scatter to form a hole.
The heavier ice crystals continue to fall and form thin, clumpy, cloudy precipitation that is visible inside and under the hole. Water and ice in these sediments evaporate before reaching the ground.
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