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[SIZE=1](image credit: Arco Images, Alamy, National Geographic)[/SIZE]
'shrooms:
[SIZE=1](image credit: Cloud Appreciation Society)
[/SIZE][CENTER]There seems to be no end to strange cloud formations! From Punch hole clouds to cloud vortices, enjoy these rarely seen cloud formations!
[/CENTER]
Punch Hole Clouds may appear as a circular or oval holes in a layer of supercooled clouds; sometimes they assume a form of a perfect circle and persist for quite a long time, drifting together with the cloud layer. One explanation seems to blame the air traffic (the jet contrail intersections) combined with a thermal inversion (a circular motion of a rising warm air). Here is one, observed over the Gunnison Valley in Colorado:
[SIZE=1](image credit: Cuerling)[/SIZE]
Another strange hole in the cloud, reported from Mobile, Alabama USA, Dec. 2003 (and covered by BBC News):
[SIZE=1](images credit: Joel Knain and Weatherlings)[/SIZE]
Photo taken in Melbourne, Australia in 2003:
[SIZE=1](images via)[/SIZE]
It seems both rising and sinking air currents can create the same effect. Sometimes a very stable, uniform layer of high-altitude clouds can get "punched though" by a pocket of cold air, which sinks toward the ground - creating the circular hole formation.
[SIZE=1](image credit: Neil Johnson(The Tampa Tribune) and Gwen Swinburne)[/SIZE]
These "cloud holes" can look like the footprints of some celestial being (UFO enthusiasts rejoice!) or can be amazingly round, like this pair observed in Gallatin, Tennessee by Wayne Carter:
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