Sep 15, 2011
A low pressure system in northern Arizona interacted with abundant moisture to produce showers and thunderstorms across southern Arizona. Some of the storms produced large hail, torrential rains, and strong winds. The Tucson International Airport recorded the fifth wettest day in recorded history.
Source: NOAA National Weather Service Storm Events Database (event 347654). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Pima County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.