Jun 29, 2025
On the morning of June 29th robust thunderstorms set up across Decatur county, part of a larger system that dropped across South Dakota and Nebraska into Iowa and merging with convection out of Missouri with increasing moisture convergence. All the ingredients for heavy, efficient rain was in place. PWATs exceeded two inches with deep warm cloud layers and very slow mean flow under 15 kts. This resulted in pockets of heavy rain, including over Decatur Iowa where three inches of rain fell in an h
Source: NOAA National Weather Service Storm Events Database (event 1276259). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Decatur County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.