May 9, 1996
As the night progressed, the area of thunderstorms continued to expand. Additional rains of 1 to 2 inches in an hour or two fell on Mahaska County, causing flooding there. In additional, the quick 1 to 3 inch rains mentioned previous over central Iowa spread into Poweshiek and Marion Counties causing the urban and small stream area to expand into those counties as well.
Source: NOAA National Weather Service Storm Events Database (event 5544259). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Poweshiek County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.