Illinois, Missouri Flood Watch | Effective 05/18/2026 11:56

Headline: 
Flood Watch issued May 18 at 1:56PM CDT until May 19 at 1:00PM CDT by NWS St Louis MO
Event: 
Flood Watch
Urgency: 
Future
Effective: 
May 18, 2026 - 11:56am
Expires: 
May 19, 2026 - 3:00am
Description: 
* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of south central Illinois, including the following areas, Bond IL, Clinton IL, Fayette IL, Marion IL and Washington IL and Missouri, including the following areas, Boone MO, Callaway MO, Cole MO, Crawford MO, Franklin MO, Gasconade MO, Moniteau MO, Montgomery MO, Osage MO, Warren MO and Washington MO. * WHEN...Through Tuesday afternoon. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - Potential rainfall amounts of 2 to 4 inches, with localized higher amounts of 4 to 6 inches.
Instruction: 
You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
Area Description: 
Bond; Fayette; Clinton; Marion; Washington; Boone; Moniteau; Cole; Osage; Callaway; Montgomery; Gasconade; Warren; Franklin; Crawford; Washington
Forcast Office: 
NWS St Louis MO
Sender: 
w-nws.webmaster@noaa.gov