A mayfly emergence from the Mississippi River near and around La Crosse, Wisconsin on the evening of July 20th produced a massive result on radar. Reports came in of swarms and piles — yes, piles — of mayflies gathering throughout the area. The National Weather Service’s La Crosse, Wisconsin Weather Forecast Office keeps track of such events that occur from Davenport, Iowa through St. Paul, Minnesota.
Wisconsin Gas Building at evening (note the famous blue flame). Milwaukee. Wisconsin UWM gave deco a bit more respect. I did a term paper on this building. The flame changed color to communicate the weather forecast.