Illinois Severe Flood Watch | Effective 08/05/2026 11:31

Headline: 
Flood Watch issued August 5 at 1:31PM CDT until August 6 at 10:00AM CDT by NWS St Louis MO
Event: 
Flood Watch
Urgency: 
Future
Effective: 
August 5, 2026 - 11:31am
Expires: 
August 6, 2026 - 2:45am
Description: 
* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of southwest Illinois, including the following areas, Greene IL, Jersey IL, Madison IL, Monroe IL and Saint Clair IL. * WHEN...From 10 PM CDT this evening through Thursday morning. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - Thunderstorms with high rainfall rates are expected to develop and track repeatedly over similar locations late this evening into Thursday morning, which will likely lead to areas of flash flooding.
Instruction: 
You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
Area Description: 
Greene; Jersey; Madison; St. Clair; Monroe
Forcast Office: 
NWS St Louis MO
Sender: 
w-nws.webmaster@noaa.gov