Aug 31, 2023
The overall pattern featured an upper-level low pressure situated along the west coast and the subtropical high pressure centered over New Mexico. This overall pattern configuration resulted in southerly flow across Arizona, which helped transport moisture into the region. Thus, the environment became conducive for thunderstorm activity as PWATs rose to 1.3-1.5 and MLCAPE values ranged between 1000-2000 J/kg across most of central and southern AZ. DCAPE values were very high, on the order of 200
Source: NOAA National Weather Service Storm Events Database (event 1132099). 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.