Sep 23, 2019
Copious amounts of tropical moisture spread northward and into south-central Arizona during the morning hours on September 23rd. The moisture combined with a strong upper low west of Phoenix to generate widespread showers and thunderstorms. Many of the stronger storms produced intense rainfall with peak rain rates between one and two inches per hour. Initially the heavy rain led to episodes of flash flooding south and east of Phoenix, but by afternoon the flooding spread into areas north of Phoe
Source: NOAA National Weather Service Storm Events Database (event 850784). 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.