Aug 10, 2021
In a moisture rich environment, with above normal PWATs and high mixing ratios, slow-moving thunderstorms in the the morning of the 10th produced very heavy rainfall, with rain rates upwards of 2 to 2.5 inches per hour, leading to localized flash flooding in parts of Maricopa and Pinal counties. Impacts included flowing washes and even a flooded exit ramp in Chandler.
Source: NOAA National Weather Service Storm Events Database (event 980671). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Pinal County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.