Partial rainbows are common enough here during the monsoon season but seeing a full rainbow doesn't happen with every storm. This afternoon we had 30 mph winds and enough thunder and lightning such that Charlie would not eat her dinner, but we only got a few drops of rain. However, we did get a whopper of a rainbow over the Catalinas.
These storms produce rainfall that is extremely local. It's very common for one town to get an inch of rain and the next town nothing at all. And, the clouds are so beautiful at sunset.