Jul 21, 2013
A very moist and unstable atmosphere led to the formation of widespread showers and thunderstorms across south central Arizona during the morning hours on July 21st. The storms were persistent and continued to develop and move slowly across the deserts well into the afternoon hours, leading to significant flooding and flash flooding. Due to the exeedingly moist nature of the airmass, there was little if any wind damage with the thunderstorms, however very heavy rain leading to flooding was comm
Source: NOAA National Weather Service Storm Events Database (event 467158). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Maricopa County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.