Sep 15, 2004
A strong southerly flow developed over Iowa as a cold frontal boundary slid southeast into the state. Low level winds of 30 to 45 kts impinged on the front during the late afternoon and into the night. Dew points rose into the low 70s, with surface temperatures in the mid to upper 80s. CAPE values were around 1500 J/kg with lifted indices in the -4 to -5 C. range. Plenty of moisture was drawn into the state with precipitable water values in the 1.5 to 2 inch range. Thunderstorms formed duri
Source: NOAA National Weather Service Storm Events Database (event 5420233). 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.