Aug 31, 2014
An unstable airmass was in place across Iowa with afternoon highs reaching well into the 80s, and dewpoint readings in the low to mid 70s. CAPE rose to 2000 to 3000 J/kg. Downdraft CAPE was around 900 to 1000 J/kg, with CAPE in the -10 to -30 C layer of the atmosphere in the 600 to 900 J/kg range. Precipitable water increased to around 1.75 inches. The freezing level was quite high at around 15,000 feet. Fairly strong shear was present with 40 to 50 kts of effective shear by late afternoon.
Source: NOAA National Weather Service Storm Events Database (event 531689). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Crawford County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.