Flood Watch

Full Alert Message

URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service St Louis MO 156 PM CDT Mon May 18 2026 ...FLOOD WATCH NOW IN EFFECT THROUGH TUESDAY AFTERNOON... * 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. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.