Jul 16, 2011
Tornado Watch number 649 was issued in the late afternoon of July 16th in anticipation of supercell thunderstorm development. A weak surface trough and low level convergence zone combined with a very unstable air mass with CAPE up to 4,000 Joules per Kilogram over south central North Dakota. This environment proved sufficient for tornadoes to develop.
Source: NOAA National Weather Service Storm Events Database (event 330585). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Wells County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.