Detecting Birds on Radar

Early morning on Tuesday August 14, WSR-88D radar from NWS Chicago/Romeoville detected birds as they left their morning roost locations. These signatures are known as "roost rings" and appear as circles radiating out from a roost location that increase in size as the birds disperse.

 

Roost Rings detected by KLOT Radar Aug 14, 2012
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Roost rings detected around the Kankakee River in Indiana and near the Illinois/Wisconsin state line in northeast IL. This radar image was captured about 40 minutes later. New roost rings are being detected along the Illinois River.



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