Residents in Virginia Beach were witness to the appearance of a 'fallstreak hole' in the clouds Tuesday afternoon.

Or at least that's what the pictures of an unusually ... of pancakes above the volcano. Such clouds are known for creating dramatic scenes, but this altocumulus standing lenticular (from the ...

Fallstreak holes are circular or elliptical holes in altocumulus or cirrocumulus ... the ground leaving behind the hole in the clouds. Here are some pictures sent in by viewers.

They form when airplanes fly through banks of midlevel altocumulus clouds ... type of plane could produce cavum clouds. NASA's Terra satellite captured photos of a "cluster" of cavum clouds ...