Attention Deficit Disorder Prosthetic Memory Program

Fallstreak Hole

ADDPMP558

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. An early satellite documentation of elongated fallstreak holes over the Florida Panhandle that likely were induced by passing aircraft appeared in Corfidi and Brandli (1986). Fallstreak holes are more routinely seen by the higher resolution satellites of today. Because of their rarity and unusual appearance, fallstreak holes have been mistaken for or attributed to unidentified flying objects.

Fallstreak Hole - © Attention Deficit Disorder Prosthetic Memory Program
House Of Pleasures - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP332
House Of Pleasures
Maratus Spider - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP259
Maratus Spider
Percussive Maintenance - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP715
Percussive Maintenance
Dreamachine - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP533
Dreamachine
Baikonur Cosmodrome - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP039
Baikonur Cosmodrome
Meteorite Pricing - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP795
Meteorite Pricing
Electron Micrograph Portraits - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP121
Electron Micrograph Portraits
Paradise Garage Acoustical Consultation - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP202
Paradise Garage Acoustical Consultation
Ophthalmic Workstations Design - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP153
Ophthalmic Workstations Design
Saddam Hussein's Novels - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP357
Saddam Hussein's Novels
Serendipity - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP410
Serendipity
Paleontologists Posing - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP664
Paleontologists Posing

You are using an outdated browser.
Please upgrade your browser to improve your experience.