Was out just cruising' with the Missus and the dogs when we saw this. I almost couldn't get the truck into park fast enough! Fortunately we were in a parking lot so the fact that I just screeched to a halt and leapt out wasn't a big deal.
@baileyadam Keep looking! This time of year they are probably plentiful, with scattered rain popping up in small areas in the middle of clear sky. Mornings and late afternoons are the best times because of the angle of the sun.