Umbra Shadow seen from Hermann Missouri
In the few minutes before totality, look out across the Missouri River Valley toward the northwest – you may see the blackness of the umbral shadow, 71 miles wide, coming at 1470 miles per hour! The umbra will reach the Calloway nuclear power plant, 20 miles away, almost a minute earlier at 40.1 seconds after 1:13pm. We may be able to literally watch it approach! However, the penumbra will be almost as dark at the boundary.