Flood Advisory — Washington County, Illinois
Minor flooding is expected — not severe enough for a warning, but potentially inconvenient or hazardous for travel.
Current Status
🌊 Active: Flood Advisory
Flood Advisory issued August 16 at 11:31PM CDT until August 17 at 2:30AM CDT by NWS St Louis MO
* WHAT...Small stream flooding caused by excessive rainfall is expected. * WHERE...Southern Washington County in south central Illinois... * WHEN...Until 230 AM CDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 1131 PM CDT, Doppler radar indicated heavy rain due to thunderstorms. This will cause small stream flooding. Between 1 and 2.5 inches of rain have fallen. - Additional rainfall amounts of 0.5 to 1 inch are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Nashville, Lively Grove, Ashley, Posen, Beaucoup, Oakdale, Radom, Du Bois, Cordes, Elkton and Stone Church.
Effective August 17, 2026 at 12:31 AM ET · Expires August 17, 2026 at 3:30 AM ET
Event Details
Event Type
Flood Advisory
Severity
minor
Issued By
NWS St Louis MO
Expires
August 17, 2026 at 3:30 AM ET
Last Checked
2 minutes ago
What To Do
📋 Official NWS Guidance
Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles.
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Frequently Asked Questions
What does a Flood Advisory mean for Washington County, Illinois?
Minor flooding is expected — not severe enough for a warning, but potentially inconvenient or hazardous for travel.
Is this Flood Advisory currently active?
Yes — this alert is active as of our last check (2 minutes ago). It's set to expire August 17, 2026 at 3:30 AM ET.
How do I get notified about Flood Advisory alerts for Washington County?
Download StormCast free on Google Play and set Washington County, Illinois as one of your monitored locations. StormCast checks the NWS feed continuously and pushes alerts like this directly to your phone — even with the screen off.