Sep 19, 2025
Upper-level troughing off the west coast promoted a pocket of upper-level divergence over south-central AZ. With MLCAPE values ranging between 250-500 J/kg and PWAT values near 1.5, scattered thunderstorm activity with heavy rainfall rates developed across portions of the Phoenix metro area and were steered northeastward into northern Maricopa County. Although the thunderstorm activity was rather unimpactful, with the flood threat limited due to the fast steering flow, training thunderstorm acti
Source: NOAA National Weather Service Storm Events Database (event 1293187). 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.