GAYLORD, MICH. -- Binoculars are usually the tool of choice for bird watching, but today it was actually a weather radar that spotted some avian action.
The U.S. National Weather Service in Gaylord today posted that its radar detected what’s known as a “roost ring” -- an expanding donut-shaped radar pattern caused by large flocks of birds leaving an overnight roosting spot en masse in the early morning.
The Weather Service shared video of the phenomenon on its Gaylord Facebook page:
Roost rings are commonly detected by National Weather Service radar this time of year, when some communal bird species such as purple martins gather at group roosting sites in the lead-up to fall migration.
At sunrise, when the birds fly away from their overnight spots to begin their day, they pass through the radar’s beam and create the ring pattern. Sometimes the ring pattern can be seen for several mornings in a row, depending on how long a flock of birds stays in one location before continuing its migration journey.
This particular roost ring was detected, fittingly, near Pigeon, Mich.
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August 18, 2020 at 01:57AM
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Radar shows ‘roost ring’ of migrating birds moving across Michigan - MLive.com
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