I was chasing with Tempest Tours yesterday. At 8:35 pm we were pulled over on the side on the road while getting blasted by RFD winds and a white van passed by. At that point we were about 2-3 miles NW of the mesocyclone and our tour director was contemplating our next move. I think we went about another mile or two before turning around and abandoning the chase because it was getting dark and they didn’t want to chase without a good view of the storm. If that white van we saw was Cloud 9 (we think it was), they must have made the decision to keep going into the notch, thinking the tornado would continue its WNW motion. Obviously it was a very costly mistake, and they’re fortunate it wasn’t worse.