Lake Fly Hatch Seen on NWS Doppler Radar

The annual spring hatch of lake flies on Lake Winnebago was detected by the NWS Green Bay Doppler radar during the morning of May 8, 2009.  Lake flies, which look like big mosquitoes, hatch each spring around this time.  Department of Natural Resource officials report there are many millions of these flies that emerge from Lake Winnebago--potentially into the trillions.  Once hatched, the lake flies live for up to two weeks before dying off.

Click for larger image - Radar image of lake flies on Lake Winnebago
Radar image of lake flies on Lake Winnebago.  Click for larger image.  
Please credit National Weather Service-Green Bay.

Click for larger image - Animation of lake flies over Lake Winnebago
Animation from 7:05 am to 7:42 am CDT showing lake flies emerging from Lake Winnebago.  Click for larger animation.
Please credit National Weather Service-Green Bay. 


USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.