Headline:
Flash Flood Warning issued May 18 at 8:09PM CDT until May 18 at 9:00PM CDT by NWS St Louis MO
Event:
Flash Flood Warning
Urgency:
Immediate
Effective:
May 18, 2026 - 6:09pm
Expires:
May 18, 2026 - 7:00pm
Description:
At 809 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
Forcast Office:
NWS St Louis MO
Sender:
w-nws.webmaster@noaa.gov