Butterfly swarm seen on weather radar

September 24, 2014 3:24 PM

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Butterfly swarm seen on weather radar

A swarm of butterflies, winging their way south for the winter, was "spotted" as large blue blobs on weather radar last week over southern Illinois and central Missouri.

"We think these targets are Monarch butterflies," the National Weather Service in St. Louis noted on their Facebook page, which also includes a technical explanation of how they came to this conclusion.

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