Illinois Weather Trivia for November 28th
- Ice crystals in the sky can sometimes cause interesting displays of light. A halo is such a display. Halos are caused when light rays are bent by ice crystals, forming a ring around the sun or moon. Weather folklore says that halos can be used to forecast precipitation. This is sometimes true, because high clouds containing ice crystals are the first clouds to move into an area ahead of an approaching low pressure system.
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