Flash Flood in Effingham County, Illinois

Flash Flood July 1, 2025 · Effingham County, Illinois

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

Heavy rain fall resulted in water flowing over 300th road north of Mason beginning at 22:00 LST on June 30th. This flooding persisted into July 1st, but quickly dissipated before 01:00 LST.

The wider storm

A slow-moving cold front interacted with a very moist, unstable airmass during the afternoon and evening of June 30th, 2025, resulting in a cluster of thunderstorms that produced heavy rainfall along and south of I-70 late that evening. Rainfall amounts of 1 to 3.5 inches occurred, which resulted in a few instances of flooding beginning on June 30th and lingering into the early morning hours of July 1st.

Began near Mason (38.9600, -88.6400).

Source: NOAA Storm Events Database, event 1261549. Narratives are written by the National Weather Service forecast office that issued the report.

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