We've seen stories like this before, where animals or bugs set off the radar, making it look like it's raining when it's really not. That happened in Duluth earlier this week. Seagulls and lake gulls migrating south were picked up on the radar and made it look like it was raining even though it was a perfectly clear morning.

NWS Duluth said that "'The bird density was about 3-6 birds at a time onscreen all going south.'"

If there are only 3-6 birds, how the heck did the radar pick it up? NWS Duluth explains it better than I ever would: "'Radar returns are based on the diameter of the scatterer to the 6th power. So the birds look like large hailstones, they really light up the display even though there aren't as many as you'd think.'" Check out this Tweet from Meteorologist Jonathan Erdman showing the birds migrating south on the radar. The big pink blob moving over Lake Superior is the birds:

 

Source: Bring Me the News

 

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