Fall Streak Hole

Dollsworth - Public Domain

Dollsworth – Public Domain

Cloud of the Day – Fall Streak Hole

Pfranson - CC-BY-SA

Pfranson – CC-BY-SA

A fall streak hole can appear in altocumulus or cirrocumulus cloud. It looks as if part of the cloud just fell out, leaving a hole. Often you can see streaks of ice crystals extending down below it. A fall streak hole is also known as a hole punch cloud, a skypunch or a cloud hole, among other names.

Beckachester - CC-BY-SA

Beckachester – CC-BY-SA

The hole is caused by the sudden freezing of super-cooled water in the cloud. Water can cool to well below freezing without forming droplets or crystals of there is no source of nucleation to allow it. The sudden introduction of a nucleation process sets off a domino effect, and the hole and fall streaks can form very rapidly. One source of nucleation is the disturbance caused by a passing aircraft.

H. Raab - CC-BY-SA

H. Raab – CC-BY-SA

Other than its association with the mentioned cloud types, a fall streak hole does not signify any particular kind of weather. Neither does it indicate that a UFO just punched through the cloud.

Kittelschürze - CC-0

Kittelschürze – CC-0

Tap pictures for large originals.

rjb

About arjaybe

Jim has fought forest fires and controlled traffic in the air and on the sea. Now he writes stories.
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7 Responses to Fall Streak Hole

  1. Anonymous says:

    WOW! These are so cool! I have never seen anything like them. Guess I don’t look up enough 😉

  2. emmylgant says:

    WOW is right! Super awesome.
    I hope I get to see one of those…
    I think it’s a daydream portal.
    In fact, I’m sure of it.,)

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