Jun 1, 1999
A frontal system stalled to the south of Iowa during the night of the 1st and began to lift north as a warm front during the day on the 2nd. At the same time an upper low moved northeast into the state. A surface low also formed under the upper low and moved along the front. Initial convection kicked off south of the surface low in the warm sector as a dry line punched east under the low. The storms that formed remained below severe levels, but did produce heavy rain and pea to marble size
Source: NOAA National Weather Service Storm Events Database (event 5698572). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Butler County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.