On the radar
Radar image of a mayfly hatch on the Mississippi, June 2006.Thanks to Jamais Cascio for approving the use of this from - "0pen the Future" -
"Swarmy Weather: The animated image on the left comes from the US National Weather Service, but it's not showing weather per se. The mass that emerges, grows and drifts along the Mississippi River is actually a swarm of mayflies:
A large mayfly hatch occurred along the Mississippi River Friday evening, June 30th. The hatch began just after sundown, around 9 PM, and continued through the early morning hours. [...] Some roads across the Mississippi River in and around La Crosse were covered with bugs, piling into "drifts" on bridges over the Mississippi River and its tributaries. [...] Notice the rapid increase in radar echoes along the Mississippi River channel...occurring simultaneously the entire length of the channel. The ambient wind flow was from the south on Friday evening, with the entire swarm of mayflies drifting north with time. The radar loop starts just before 9 PM CDT and ends around 1030 PM CDT."
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