Weather Alerts For O'Fallon, MO

# HEADLINE -------------------- WIND ADVISORY IN EFFECT FROM 1 PM TO 8 PM CDT WEDNESDAY # DETAILS -------------------- WHAT Southwest winds 20 to 30 mph with gusts up to 45 mph expected. WHERE Portions of south central and southwest Illinois and east central Missouri. WHEN From 1 PM to 8 PM CDT Wednesday. IMPACTS Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. ISSUED AT Tuesday, June 16, 2026 at 12:39 PM CDT ISSUED BY National Weather Service St Louis MO HEADER URGENT - WEATHER MESSAGE # PRECAUTIONARY/PREPAREDNESS ACTIONS -------------------- Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. Secure outdoor objects. # AREAS AFFECTED -------------------- Marion IL, Saint Louis City MO, Bond IL, Calhoun IL, Clinton IL, Fayette IL, Greene IL, Jersey IL, Lincoln MO, Macoupin IL, Madison IL, Montgomery IL, Saint Charles MO, Saint Clair IL, Saint Louis MO, Warren MO, Washington IL Including the cities of Saint Louis, Saint Charles, Edwardsville, Cahokia, Salem, Vandalia, Alton, Centralia, Litchfield, and Belleville