Jun 15, 2023
On June 15th, roughly between 300 PM and 415 PM MDT, slow moving thunderstorms fueled by a wet air mass led to heavy rain over parts of Natrona County, including the city of Casper, WY and surrounding suburbs. Rainfall rates of 1 to 2 inches per hour were common for many locations. These high rainfall rates combined with other factors, such as wet antecedent conditions, hilly topography, and urban impermeable surfaces resulted in the flash flood event that afternoon and evening.
Source: NOAA National Weather Service Storm Events Database (event 1105307). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Natrona County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.