I don't think Phoenix does it. I've never heard anything but a general flash flood warning - be careful around washes - announcement in 34 years. But then again who knows, it used to just be monsoon season and everyone looked forward to some nice afternoon storms. Now all the TV stations have special Monsoon Reports, half hour long specials at the beginning of the season. But what really kills me is the Doomsday-like warnings we've been getting on our cell phones. The same sound they use for testing the emergency broadcast system on TV is what they use for storms. It's crazy in the office when everyone's phone goes off at the same time.