Mayflies Seen on Radar

This radar image was obtained by the National Weather Service Weather Forecast Office in La Crosse. The area depicted is where the states of Minnesota, Wisconsin, and Iowa meet.
A mayfly hatch along the Mississippi River was caught on Doppler radar out of NWS La Crosse this evening. The radar view below shows an image at 9:13 p.m. CDT on Saturday, May 29, 2010. The bugs are showing up as bright pink, purple, and white colors along the Mississippi River mainly south of La Crosse, WI. After the bugs hatch off the water and river areas, they are caught in the south-southeast winds while airborne for about 10-20 minutes.

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Having personally driven through one of these hatches (in this exact area, actually), I can attest that they are dangerous and extremely gross.
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In another lifetime I was a deckhand on the Ohio and Mississippi for a few months after college. We motored through a gigantic cloud of these one day; they really were on every conceivable surface, and all over me. Absolutely harmless, but I danced the 'funky chicken' trying to get them off of me until I was too exhausted to do anything but mentally moan in creeped-out disgust.
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