May 29, 2013
A warm front moved slowly north into Iowa during the overnight hours of the 28th into the 29th. The airmass became unstable as surface temperatures warmed into the low 80s, with dewpoints around 70 along and south of the front. CAPE rose to around 3000 J/kg with a downdraft CAPE of 900 J/kg, and CAPE in the -10 to -30 C layer of the atmosphere of 600 to 800 J/kg. The lifted index fell to -9 C. Considerable moisture was available with the precipitable water values around 1.7 inches. The atmo
Source: NOAA National Weather Service Storm Events Database (event 443164). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Grundy County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.