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
Prison Landscapes - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP305
Prison Landscapes
Saturn's Hexagone - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP510
Saturn's Hexagone
Aluminium Foiled Rooms - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP324
Aluminium Foiled Rooms
Eye Strain - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP235
Eye Strain
List of films that most frequently use the word "fuck" - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP494
List of films that most frequently use the word "fuck"
Parental Advisory - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP416
Parental Advisory
Luther Blissett Collective - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP015
Luther Blissett Collective
Sea Org Contract - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP022
Sea Org Contract
Timeline Of The Far Future - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP337
Timeline Of The Far Future
Piano Stride - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP318
Piano Stride
Balkan sworn virgins - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP107
Balkan sworn virgins
Overview effect - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP093
Overview effect

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