Jun 28, 2018
An extremely unstable atmosphere combined with very strong deep layer wind shear set the stage for intense thunderstorm development. Initially, thunderstorms were supercells, and formed along a warm front that lifted through North Dakota in the afternoon and evening hours. One of the supercell thunderstorms produced flash flooding in Dunn and Mercer counties, while another produced 3.50 inch diameter hail over Wells County. During the evening and overnight hours a line of intense thunderstorms d
Source: NOAA National Weather Service Storm Events Database (event 763408). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Dunn County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.