I lived in Phoenix for most of my life. Family in Tucson.
Monsoon season can be dramatic at times. Those micro-cells you just described can be devastating.
for those of you who don't know, Tucson is in the high desert and gets a lot more rain than Phoenix. As a result, a lot of springs exist and more critters can live there. Every now and then a mountain lion wanders into the city, and SWAT teams are activated. They only catch about half of the lions, the others just wander out again.