Monday, December 29, 2008

Punch hole clouds


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).

More interesting clouds formation here.

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