Here is a blog entry made by the CIMSS Satellite Blog folks on today’s extremely powerful derecho event in the mid-west. At one point, the storm looked like a hurricane from both the radar and satellite views with an incredible comma shape precip echo on radar that nearly wrapped around the entire storm and traverse banding spreading out from the upper layers of the storm. See one of my previous posts for a screenshot of radar reflectivity earlier.
At 18:25 GMT a wind speed of 106mph was measured in Illinois and hail up to 2.75 inches measured in Missouri at 14:34 GMT. Now THAT is an incredible derecho!
