Aug 30, 2020
The monsoon high broke down over Arizona late in August with a trough setting up over the southwest U.S. leading to southwest flow over the state. Tropical moisture was able to push up the Gulf of California into Arizona under this setup. This prompted a Flash Flood Watch for the central and southern Arizona deserts for the 29th and 30th. With well above normal moisture levels, training of storms and high rain rates were able to produce flash flooding in the afternoon and evening hours of both d
Source: NOAA National Weather Service Storm Events Database (event 912700). 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.