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Is this picture trying to
tell you something? Perhaps.
A lunar halo can, in some
cases, precede wet weather. It is formed high in the atmosphere, above 25,000
feet (7.6 kilometers), when moonlight refracts off ice crystals.
Lunar halos can't serve
as perfect predictors, but in warm weather they tend to foretell thickening
clouds. Rain may come within 18 hours.
Stan Richard, a public television
engineer from Iowa, took this picture of a moon halo in the winter of 2000 when
there was an "ice fog." [Reading
the Sky]
-- Robert
Roy Britt
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