Mysterious Cloud on Radar Is Only Butterflies

1,201 views · Published 1 October 2014 · 1:10 · Indexed 20 September 2026

Channel: Slate · 2014 · Entertainment

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When Illinois and Missouri weather services detected something strange on their radar last week, they weren't sure exactly what it was. However, the National Weather Service has cleared up the mystery: the strange blue cloud seen on radar screens was actually swarms of monarch butterflies, making their annual journey south for the winter.

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