A towering cumulus cloud near Panama City, Florida, on Saturday was photographed with a feature that looks similar to a halo at its very top.

The wispy-looking cloud that makes up the halo is what is called a Pileus cloud. They are not uncommon, but are sometimes tough to spot since they tend to be short-lived.

Pileus clouds typically form at the very top of a growing cumulus or cumulonimbus cloud. As you may know, cumulonimbus clouds are associated with thunderstorms.

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The pileus cloud develops when there is a flow of moist, stable air over the top of a cumulus or cumulonimbus cloud. Rising air associated with the cumulus or cumulonimbus cloud lifts up the moist, stable air above, allowing it to condense. The result is the wispy cloud on top that can appear to look like a halo as illustrated by the photos.

Pileus clouds typically do not last very long since the growing cumulus or cumulonimbus cloud usually overtakes them.

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