I was watching doppler radar for local/ state weather conditions for the morning and noticed a perfect circle approx 30 miles in diameter at first I thought it was just some kind of radar malfunction, but the anomaly moved disapeared and then came back north while another apeared over chicago area. I just thought this strange, as i have never seen that before and i look at the radar almost everyday. I have web snapshots of the event. I did not see any obect first hand in the sky.
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