Jun 12, 2010
A very humid and unstable airmass was in place over Iowa during the evening of the 11th into the morning of the 12th. A strong push if moisture pushed precipitable water values to over 2 inches over southern Iowa by evening. Surface dew point temperatures rose to the mid 70s to around 80. The airmass was quite unstable with 3000 to 4000 J/kg of CAPE available and a lifted index around -8 C. There was little shear present however and steering winds were quite light. Thunderstorms formed init
Source: NOAA National Weather Service Storm Events Database (event 224588). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Marion County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.