We were curious what was lighting up our radar screen this morning, turns out a lot of seagulls or lake gulls are flying south across the head of Lake Superior this morning. #mnwx #wiwx #lakesuperior pic.twitter.com/tribeDe2wp

— NWS Duluth (@NWSduluth) June 11, 2019

NWS Duluth also tweeted: “The bird density was about 3-6 birds at a time onscreen all going south. Radar returns are based on the diameter of the scatterer to the 6th power. So the birds look like large hail stones, they really light up the display even though there aren’t as many as you’d think.”