Paul Schlatter of the National Weather Service first thought flocks of birds were making the pattern he saw on radar, but the cloud was headed northwest with the wind, and migrating birds would be southbound in October. What he actually saw on a Denver-area radar screen turned out to be a 110-kilometre-wide migration of Painted Lady butterflies.
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That's amazing, a couple guys on my truck forum in Alberta and Montana reported several inches of snow on Sunday Oct 1st. Those butterflies better skedaddle south.
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