Cropped

While swimming at a friend's place, had a storm approach very quickly. It was so sunny out, just 10 minutes before this shot. Turns out, it was a very isolated storm cell that popped up unexpectedly to all. Only half the city experienced it.
In this pic, it almost looked like a twister was forming but it was just the clouds looking like that.
It was a 92° day but dropped 10 degrees in that 10 minute period from sunny to darkness and stormed for an hour. NO rain was predicted for the whole day.