Jul 8, 2025
An upper-level disturbance interacting with an outflow boundary triggered scattered showers and thunderstorms in the Illinois River Valley during the morning of July 8th. This initial band of showers tended to dissipate toward midday: however, as the atmosphere destabilized during peak heating, an uptick in convective development was noted further east along and east of I-55 by late afternoon into the evening. With ample deep-layer moisture in place as evidenced by precipitable water values of
Source: NOAA National Weather Service Storm Events Database (event 1261876). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in McLean County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.