Oct 6, 2018
Southern Iowa found itself north of a relatively stationary surface boundary, which was laid out across northern Missouri. An 850mb front was situated a bit further north, over much of southern Iowa, with a decent moisture fetch from the Gulf of Mexico. Given the relation to the surface front, elevated showers and storms were the name of the game. MUCAPE values were generally around 1000 to 1500 J/kg, along with precipitable water values approaching 1.5 to 1.75 inches, climatologically anomalous
Source: NOAA National Weather Service Storm Events Database (event 789911). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Mahaska County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.