Iowa, Illinois Severe Flash Flood Warning | Effective 09/20/2026 00:40
At 240 AM CDT, Doppler radar indicated thunderstorms producing heavy
rain moving back across the warned area. Between 1 and 2 inches of
rain has already fallen from earlier activity. Additional rainfall
amounts of 1 to 3 inches are possible in the warned area over the
next few hours. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
IMPACT...Flash flooding of small creeks and streams, urban areas,