A fallstreak hole (also known as a cavum, hole punch cloud, punch hole cloud, skypunch, cloud canal or cloud hole) is a large gap, usually circular or elliptical, that can appear in cirrocumulus or altocumulus clouds. The holes are caused by supercooled water in the clouds suddenly evaporating or freezing, and may be triggered by passing aircraft. Such clouds are not unique to any one geographic area and have been photographed from many places. Read more about this here- https://en.wikipedia.org

First Alert Focus: Hole punch cloud

Here's a spectacular timelapse of a Fallstreak Hole passing right over FOX23 News at sunset. The hole is caused by unfrozen supercooled water that freezes and falls below the cloud (seen as a cirrus patch below the hole) | FOX23 Chief Meteorologist James Aydelott