had a stormchase on July 26 and followed a rotating lp cell behing a group of large classic storms. I followed it for well over an hour before it did this as it was wrapped up hard. Condensation began to rotate messily around on the ground under a nub lowering and soon took off lasting for a few minutes then coming and going for another few , then a larger lowering formed and had some condensation on the ground as well , however not as dramatic