Tornadoette?

So yesterday around 6:15pm I was driving on 69W, just about to exit onto 127S. Up ahead, my view partially obstructed by the on/off ramps, it looked like there was a fire. I could see smoke rising up and quickly building and getting thicker. It looked like it was right next to 127 and I would have a clear view of what ever it was as soon as I came around the ramp. What I thought was smoke, was really dust. It was swiriling up in the beginnings of a tornado and was about 200ft away from me. I stopped under the overpass along with many other cars. The road signs started twisting side to side, my car started rocking and shaking, then it slowly dissapated. There was still a opaque cloud of dust across the road ahead. When I started driving again there was a 180 degree wall of dust around me. I've definitely never seen anything like that. I took a picture with my camera phone while I was sitting under the over pass. It's pretty poor quality, but better then nothing.