This is the third year that I have participated in the MS Tour de Farms ride in Dekalb, IL as a part of the motorcycle safety crew. My job on the morning of 6/22/13 was to control the flow of 3,000 cyclists through the intersection of Nelson and Rich Roads. Weather had delayed the start for 1-hour, but now it was on. Then out of the west … Some winds, a drip in temperature, but no rain! Taken with my iPhone in HDR and stitched together in Photoshop.
PS: This is wall cloud, not a derecho.