Jun 5, 2010
A weak cold front moved southeast across Iowa early on the 4th and had become stationary east-west to the south of the state. The thermal gradient increased during the day and moisture pooled along the front by evening. The atmosphere became quite unstable by late afternoon with temperatures reaching well into the 90s south of the front, and dew point readings rising into the low 70s along the front. CAPE was in the 3000 to 4000 J/kg range by mid to late evening with lifted indices in the -5
Source: NOAA National Weather Service Storm Events Database (event 223523). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Union County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.