Jul 27, 2009
Deep layer shear with a short wave trough interacted with instability ahead of a surface trough trailing from a surface low in central Wisconsin. The instability and shear produced supercell thunderstorms in southern Wisconsin along and ahead of the surface trough. The severe thunderstorms produced damaging winds, large hail and tornadoes. Heavy rains accompanying the severe thunderstorms produced flash flooding in Lafayette County.
Source: NOAA National Weather Service Storm Events Database (event 191149). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Iowa County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.