Flash Flood in Winnebago County, Illinois

Flash Flood April 15, 2026 · Winnebago County, Illinois

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

What the National Weather Service wrote

At least one basement was flooded in Machesney Park.

The wider storm

Isolated severe thunderstorms produced flooding and marginally severe hail in the early morning of April 15th across far northern Illinois. Scattered thunderstorms moved across most of northern Illinois during the evening of April 15th producing localized wind damage, hail and flooding.

Began near Harlem (42.3395, -89.0280).

Source: NOAA Storm Events Database, event 1333695. Narratives are written by the National Weather Service forecast office that issued the report.

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