Posted by: Sandy Steinman | September 15, 2018

Strange Clouds Over Berkeley – Updated

Strange clouds seen over Berkeley and Oakland today. A quick iPhone shot.  Could this be a UFO?

from wikipedia:

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. Such holes are formed when the water temperature in the clouds is below freezing but the water, in a supercooled state, has not frozen yet due to the lack of ice nucleation. When ice crystals do form, a domino effect is set off due to the Bergeron process, causing the water droplets around the crystals to evaporate: this leaves a large, often circular, hole in the cloud.

It is thought that the introduction of large numbers of tiny ice crystals into the cloud layer sets off this domino effect of fusion which creates the hole. The ice crystals can be formed by passing aircraft, which often have a large reduction in pressure behind the wing- or propeller-tips. This cools the air very quickly, and can produce a ribbon of ice crystals trailing in the aircraft’s wake. These ice crystals find themselves surrounded by droplets, and grow quickly by the Bergeron process, causing the droplets to evaporate and creating a hole with brush-like streaks of ice crystals below it.

Such clouds are not unique to any one geographic area and have been photographed from many places.

Because of their rarity and unusual appearance, fallstreak holes have been mistaken for or attributed to unidentified flying objects


Responses

  1. The sky was amazing in SF yesterday and I saw this incredible formation. It was on the news last night and they called it a “Hole-Punch Cloud which can be formed by an airplane flying through the marine layer!

    Like

  2. Thanks so much for sharing your photo, but more so , for all of your generosity and perseverance in helping to keep us informed. I’m in awe…and share articles often.

    With warm regards. Sally Arney

    Sent from my iPhone

    >

    Like


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