I thought of migrating birds, as they sometimes show up on radar, but there does not appear to be anything here[1] corresponding to this event. [1] http://bird

I thought of migrating birds, as they sometimes show up on radar, but there does not appear to be anything here[1] corresponding to this event. [1] http://birdcast.info/live-migration-maps/ http://birdcast.info/live-migration-maps/ Update: I got the date wrong, this would have been Dec 10... Data is missing from 10:40 to 16:10 CT, and the spatial resolution is not high, but the map is showing medium rates of migration in that area at the later time.