Aug 3, 2010
A quasi-stationary front extended from central Kansas into northern Illinois. The airmass was very unstable with high temperatures reaching the low to mid 90s over southern Iowa, with dew point readings in the mid to upper 70s. By evening, CAPE was in the 3000-5000 J/kg range with lifted indices falling to -6 to -8. The downdraft CAPE available was between 900 and 1400 J/kg, with 600-700 J/kg in the -10 to -30 C layer of the atmosphere. Precipitable water values were around 2 to 2.3 inches.
Source: NOAA National Weather Service Storm Events Database (event 246836). 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.