Flood in Hamilton County, Illinois
Flood July 19, 2025 · Hamilton County, Illinois
Where the report was made, with tornadoes recorded within 15 miles over the years.
What the National Weather Service wrote
Areal flooding remained through the afternoon following the torrential rainfall early afternoon, mainly in northwestern Hamilton County. Approximately 8 to 10 inches of water was across Highway 242 at Blairsville Road. Several secondary roads were flooded across Hamilton County.
The wider storm
As high pressure slowly crept northward towards the Quad State region, ridging remained over the middle Mississippi River Valley. A slow-moving MCS moved through the northeastern half of the Quad State midday to near sunset. CAPE rose to 1000-2000J/kg in northern portions of Southern Illinois with effective bulk shear around 30kts. Extremely high moisture content with precipitable water values of 2.25in resulted in torrential rainfall rates along and near the I-64 corridor. Several areas reported flash flooding, especially northern Wayne County which had radar estimated totals of up to half a foot in northwestern portions of the county and sandbags deployed in Cisne. Flash flooding was also reported in Hamilton, Franklin, and Williamson counties. Albion reported 3.12in of rainfall within four hours.
Began near Mc Leansboro Muni Ar (38.0810, -88.5130).
Source: NOAA Storm Events Database, event 1305237. Narratives are written by the National Weather Service forecast office that issued the report.
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