Flash Flood — Shelby, Illinois

2025-07-20 to 2025-07-21 · near Cowden, Shelby, Illinois

Event narrative

Many streets in Cowden had water flowing across them.

Wider weather episode

An outflow boundary interacting with a very moist airmass characterized by surface dewpoints in the middle to upper 70s triggered clusters of strong to severe thunderstorms across south-central Illinois during the afternoon and evening of July 20th. Scattered wind damage and flash flooding occurred...mainly south of a Shelbyville to Marshall line.

View location on OpenStreetMap → (39.2588, -88.8748)

Source: NOAA Storm Events Database, event_id 1276279. Narrative written by the NWS forecast office that issued the report.