What Is a Fallstreak Hole?
Fallstreak hole (also called a “hole-punch cloud”) forms in altocumulus or cirrocumulus clouds.
These clouds often contain supercooled water droplets—liquid water that remains unfrozen below 0°C.
When something triggers freezing (like passing aircraft or natural disturbances), the droplets crystallize into ice.
The ice crystals fall, leaving a circular or oval gap that looks like the sky has torn open.
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