December 13, 2002, Newsletter Issue #33: Cirrostratus

Tip of the Week

These sheet-like, thin clouds form above 18,000 feet. Cirrostratus clouds are so thin that the sun and moon can be seen clearly through the cloud. Sometimes these clouds are so thin that the only clue to their presence is a halo around the sun or moon. Ice crystals in cirrostratus clouds bend the light rays from the sun or moon as they pass through the cloud, which forms the halo around the sun or moon.

Thick cirrostratus clouds give the sky a bright white appearance and often signal rain or snow within 24 hours, especially if they are followed by mid-level clouds.

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