Sep 14, 2015
Multiple strong thunderstorms producing heavy rainfall moved through southwest Utah on September 14, creating significant flash flooding in Hildale, Utah and Zion National Park. These two flash flood events combined to produce the deadliest natural disaster in Utah history, with 20 fatalities in the state of Utah, and a 21st just south of the border in Arizona.
Source: NOAA National Weather Service Storm Events Database (event 602738). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Washington County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.