Illinois, Missouri Flood Watch - Severe | Effective 06/11/2026 09:50

Headline: 
Flood Watch issued June 11 at 11:50AM CDT until June 11 at 7:00PM CDT by NWS St Louis MO
Event: 
Flood Watch
Urgency: 
Future
Effective: 
June 11, 2026 - 9:50am
Expires: 
June 11, 2026 - 5:00pm
Description: 
* WHAT...Flash flooding caused by excessive rainfall is possible. * WHERE...Portions of west central Illinois, including the following areas, Adams IL and Brown IL and northeast Missouri, including the following areas, Knox MO, Lewis MO, Marion MO and Shelby MO. * WHEN...Until 7 PM CDT this evening. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Area creeks and streams are running high and additional heavy rain rates could cause new flooding, or worsen ongoing flooding. * ADDITIONAL DETAILS... - A brief round of thunderstorms with heavy rain rates is expected later this afternoon and evening, and while this round will only last 1 to 3 hours, these areas have already seen considerable recent rains and area creeks and streams are already swollen. As such, additional Flash Flooding will be possible late this afternoon and evening.
Instruction: 
You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
Area Description: 
Adams; Brown; Knox; Lewis; Shelby; Marion
Forcast Office: 
NWS St Louis MO