Wisconsin Bow Echo
On July 10, 2008 a squall line moved across portions of Minnesota and Wisconsin. This line of storms produced wind gusts of 60-70 mph at numerous locations. Widespread wind damage was reported by law enforcement and local emergency management personnel.
In image 3 you will see a hook echo that developed along the leading edge of the squall line/bow echo, later in its life cycle. A cyclonic circulation (mesocyclone) can be seen on the storm-relative velocity (SRM) map. SRM data is useful in detecting rotation within a thunderstorm. In this particular case no tornado warning was issued. Wind damage, however, was reported with this storm.