Massive Wave of Butterflies Lights Up Denver Weather Radar
Painted Lady butterflies feed on Sedum flowers in Omaha, Neb., Tuesday, Sept. 19, 2017.
Photographer: Nati Harnik/APThis article is for subscribers only.
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 National Weather Service said he first thought flocks of birds were making the pattern he saw on the radar Tuesday, but the cloud was headed northwest with the wind, and migrating birds would be southbound in October.