A Monarch butterfly gathers pollen from a flower at Dillingham Memorial Garden in Enid, Okla, Thursday, Sept. 11, 2014. The butterflies are on their annual migration from Canada and the northern United States to Mexico. (AP/Enid News & Eagle, Billy Hefton)
The weather was beautiful in St. Louis, Mo. on Friday morning: 70 degrees and clear blue sky. Which is why forecasters were surprised by what they were seeing on their radar screens, which they now think were migrating Monarch butterflies.