May 17, 2013
A stationary front that had been over southern Iowa began to lift north as a warm front on the morning of the 17th. The atmosphere had become more unstable during the morning with CAPE increasing to 1000 to 2000 J/kg. Precipitable water values increased to about 1.4 inches by late morning. The atmosphere exhibited very little shear. Thunderstorms developed during the morning and tracked slowly north. The storms produced very heavy rainfall of 2 to 6 inches in a short period of time, under 3
Source: NOAA National Weather Service Storm Events Database (event 440177). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Winnebago County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.