329 million birds are expected to migrate through the eastern US after sunset on Thursday, September 14. The Cornell Lab of Ornithology and Colorado State University produce these forecasts using data from the past 23 years of bird movements in the atmosphere, as detected by the US NEXRAD weather surveillance radar network.

September 12, 2023  |  Source: BirdCast | Bird migration forecast maps  |  Photo credit: Cornell Lab of Ornithology and Colorado State University