Huge ‘Mayfly Hatch’ Caught On Radar, Overwhelms Upper Midwest

Published on Jul 22, 2014 by DAHBOO77

On the evening of July 20, 2014 mayflies hatched along along the Mississippi river between Minnesota and Wisconsin in such great numbers that they were picked up by radar resembling light rain. the hatch began around 8:35pm. According to the National Weather Service: “this particular emergence was that of the larger black/brown Bilineata species. The radar loop below shows the reflected radar energy (reflectivity) from 8:35 pm to just after midnight. The higher the values (greens to yellows) indicate greater concentrations of flies. Note how the swarm is carried northward over time.”…

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