Illinois Severe Flash Flood Warning | Effective 09/17/2026 05:51
At 751 AM CDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between 3
and 5 inches of rain have fallen. Additional rainfall amounts up to 1
inch are possible in the warned area. Flash flooding is already
occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar and automated gauges.
IMPACT...Rapid-onset flooding of creeks, streams, drainage ditches,
streets, underpasses, low-lying areas, and other poor
drainage areas.