As we were driving south from Flagstaff to Phoenix we went through a mountain range. Made for very slow climbing on one side and then as we headed down the other side we picked up speed. Just at that point Dad spotted this rain storm off in a valley. Then it disappeared behind a hill. So around the next corner I yelled "STOP STOP" and jumped out to grab the picture. It's so curious how all around it can be sunny and then in the middle it's pouring.