Flash Flood — Effingham, Illinois

2025-06-30 · near Mason, Effingham, Illinois

Event narrative

Water was flowing over 300th Avenue on the north side of Mason. Flooding continued at this location into the early morning hours of July 1st, 2025, before dissipating.

Wider weather episode

A slow-moving cold front progressed across Illinois during the afternoon and evening of June 30th, 2025, interacting with a very moist, unstable airmass and resulting in clusters of thunderstorms. Eventually, these clusters of storms grew into a slow-moving complex that produced heavy rain along and southeast of the I-70 corridor, with rainfall amounts ranging from 1 to 3.5 inches. This resulted in a few instances of flash flooding. These areas of flooding persisted into the early morning hours of July 1st, 2025.

View location on OpenStreetMap → (38.9600, -88.6400)

Source: NOAA Storm Events Database, event_id 1261533. Narrative written by the NWS forecast office that issued the report.