Posted Wednesday, June 24, 2009 --- 3:55 p.m.

From the National Weather Service:

A single thunderstorm cell developed in Rock county Tuesday evening producing an EF0 landspout tornado. The first report of a funnel cloud was received at 7:55 pm from a pilot flying into the Janesville airport. A Tornado Warning was then issued at 8 pm. Subsequent funnel and tornado reports were received from the Janesville airport tower, trained spotters and the public.

A damage survey and radar images indicate the tornado touched down at approximately 8:10pm and moved southeast with an intermittent damage path 1.6 miles long. The tornado produced minimal damage around Clear Lake. A screen porch including metal foundation was flipped over a trailer just southeast of Clear Lake. Some tree and powerline damage was also observed mostly southeast of Clear Lake.

This storm was very small in size and the only one in southern Wisconsin Tuesday evening. The first funnel cloud reports came in just 15 minutes after the cell developed. It weakened and the cell dissipated about half an hour later.

A landspout tornado is one that is not associated with a broad area of rotation known as a mesocyclone. Landspout tornadoes are normally smaller and weaker than the average supercell tornado.