"During periods of seasonal bird migration, “live” migration maps show where nocturnal bird migration is occurring in near real-time, as detected by the U.S. weather surveillance radar network between local sunset to sunrise. The maps show how many birds are present and in what direction they are moving.
Radars in mountainous areas (e.g. the Rockies) may be located on high mountaintops that restrict radar coverage, providing the appearance of no migration where migration may be occurring.
Please note that all graphics are relative to the Eastern time zone. Data are presented for the contiguous U.S. only."
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