Headline:
Flash Flood Warning issued May 18 at 5:06PM CDT until May 18 at 9:00PM CDT by NWS St Louis MO
Event:
Flash Flood Warning
Urgency:
Immediate
Effective:
May 18, 2026 - 3:06pm
Expires:
May 18, 2026 - 7:00pm
Description:
FFWLSX
The National Weather Service in St Louis has issued a
* Flash Flood Warning for...
Western Clinton County in south central Illinois...
Southern Madison County in southwestern Illinois...
Northwestern Monroe County in southwestern Illinois...
Saint Clair County in southwestern Illinois...
Northeastern Jefferson County in east central Missouri...
Eastern Saint Louis County in east central Missouri...
East Central Saint Louis City in east central Missouri...
* Until 900 PM CDT.
* At 506 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. Additional rainfall amounts of 1 to 2 inches are
possible in the warned area. 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,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Belleville, Granite City, O'Fallon, East St. Louis, Collinsville,
Edwardsville, Fairview Heights, Cahokia, Swansea, Glen Carbon,
Shiloh, Highland, Troy, Waterloo, Columbia, Maryville, Mascoutah,
Pontoon Beach and Centreville.
This includes the following State Parks...
Frank Holten State Park and Horseshoe Lake State Park.
This includes the following highways...
Interstate 64 in Illinois between exits 9 and 27. Interstate 70 in
Illinois between exits 21 and 30.
Instruction:
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Area Description:
Clinton, IL; Madison, IL; Monroe, IL; St. Clair, IL; Jefferson, MO; St. Louis, MO; St. Louis City, MO
Forcast Office:
NWS St Louis MO
Sender:
w-nws.webmaster@noaa.gov