Keen observers of our radar data probably noticed some fairly high
returns moving south over southern Illinois and central Missouri. High
differential reflectivity values as well as low correlation coefficient
values indicate these are most likely biological targets. High
differential reflectivity indicates these are oblate targets, and low
correlation coefficient means the targets are changing shape. We think
these targets are Monarch butterflies. A Monarch in flight would look
oblate to the radar, and flapping wings would account for the changing
shape! NWS St. Louis wishes good luck and a safe journey to these
amazing little creatures on their long journey south!
From the Facebook page of the
U.S. National Weather Service in St. Louis Missouri.
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