A lacy, cloud-like pattern drifting across a Denver-area radar screen turned out to be a 70-mile-wide (110-kilometer) wave of butterflies, forecasters say.

A lacy, cloud-like pattern drifting across a Denver-area radar screen turned out to be a 110km-wide swarm of butterflies, forecasters say.

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DENVER — A lacy, cloud-like pattern drifting across a Denver-area radar screen turned out to be a 70-mile-wide wave of butterflies, forecasters say.

DENVER (AP) – A lacy, cloud-like pattern drifting across a Denver-area radar screen turned out to be a 70-mile-wide (110-kilometer) wave of butterflies, forecasters say. Paul Schlatter of the ...

A lacy, cloud-like pattern drifting across a Denver-area radar screen turned out to be a 70-mile-wide (110-kilometer) wave of butterflies, forecasters say.

A lacy, cloud-like pattern drifting across a Denver-area radar screen turned out to be a 70-mile-wide (110-kilometer) wave of butterflies, forecasters say.