Flash Flooding Likely in Northern IL, Central and Northern IN, and Western OH
• Heavy showers and thunderstorms are expected to develop and expand across Northern Illinois, Central and Northern Indiana, and Western Ohio overnight.
• According to the Weather Prediction Center (WPC), this activity is driven by an elevated instability gradient and warm air advection over a stationary front in the Middle Mississippi and Ohio Valleys.
Impact & Risks
The primary concern is flash flooding, which could become significant and dangerous in localized areas. Communities in Northern Illinois, Central and Northern Indiana, and Western Ohio are at heightened risk, especially where recent rainfall has already lowered flash flood guidance values. The HREF model indicates a 40-70% probability of flash flood guidance exceedance in parts of Eastern Illinois and Central Indiana. Residents in these areas should remain vigilant as conditions may deteriorate rapidly overnight.
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