Something besides rain was captured by our radar this morning. These donut-shaped loops are likely caused by birds taking off in flight. Sometimes the radar beam ducts downward in certain conditions such that it can detect things like birds and insects. #pawx #njwx #dewx #mdwx pic.twitter.com/YGjO1N9kBu

— NWS Mount Holly (@NWS_MountHolly) July 31, 2018