What is going on over the eastern Great Lakes Huron, Erie, and Ontario on December 13, 2005?
( http://www.cira.colostate.edu/cira/RAMM//picoday/051214/visloop.html ) and data below for additional help. Clicking on each image below will bring it up the full sized.
Answer: These are simultaneous mesoscale vortices over the Great Lakes during the winter of (December 14) 2005. These phenomena are typically observed when arctic air is warmed from below by the relatively warm water of these huge lakes during late fall/early winter. For more on these regional events, please see: http://www.cira.colostate.edu/cira/RAMM//picoday/051214/051214.html.