Flash Flood in Effingham County, Illinois
Flash Flood June 30, 2025 · Effingham County, Illinois
Where the report was made, with tornadoes recorded within 15 miles over the years.
What the National Weather Service wrote
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.
The wider storm
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.
Began near Mason (38.9600, -88.6400).
Source: NOAA Storm Events Database, event 1261533. Narratives are written by the National Weather Service forecast office that issued the report.
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