Arizona can flood after an inch or so of rain. Some of these floods occur quickly, called flash floods. That's partially because they get most of their annual rainfall during a few months out of the year called the monsoon season. Find WeatherSphe
Monsoon season continues across the Desert Southwest.
It's the time of year when that region receives most of its annual rainfall.
In addition to getting all of their rain at once, there are other factors at play resulting in the flooding that's so common this time of year.