Jul 21, 2021
With enhanced easterlies on the south end of the monsoon high and embedded weak perturbation waves rolling west across southern Arizona, scattered strong to severe thunderstorms developed in a moist unstable environment throughout the afternoon and evening on the 21st. Most storms in the afternoon developed across southwest Arizona, between Phoenix and the Colorado River, with sporadic storm motions driven by outflows and cell mergers. In the evening, new showers and thunderstorms developed and
Source: NOAA National Weather Service Storm Events Database (event 976254). 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.