ST. LOUIS | An active Severe Thunderstorm Warning is in effect for St. Louis City and St. Louis County. CGN News is publishing this alert because official National Weather Service alert data includes one or more CGN coverage areas: St. Louis County, Missouri and St. Louis City, Missouri.
What is active now
The primary active alert is Severe Thunderstorm Warning with NWS severity listed as Severe, urgency listed as Immediate and certainty listed as Observed.
The alert became effective 10 July 2026 at 8:58 PM EDT. The current listed expiration or ending time is 10 July 2026 at 9:45 PM EDT. Readers should rely on the latest county-specific National Weather Service alert before making safety decisions.
Current official alerts
Severe Thunderstorm Warning: NWS lists the affected area as Calhoun, IL; Lincoln, MO; St. Charles, MO; St. Louis, MO; Warren, MO. Current listed expiration or ending time: 10 July 2026 at 9:45 PM EDT.
Severe Thunderstorm Watch: NWS lists the affected area as Monroe, IL; Randolph, IL; St. Clair, IL; Washington, IL; Crawford, MO; Franklin, MO; Gasconade, MO; Iron, MO; Jefferson, MO; Madison, MO; Montgomery, MO; Osage, MO; Reynolds, MO; St. Charles, MO; Ste. Genevieve, MO; St. Francois, MO; St. Louis, MO;…. Current listed expiration or ending time: 11 July 2026 at 1:00 AM EDT.
Coverage area
This CGN alert covers St. Louis County, Missouri and St. Louis City, Missouri. Nearby communities may experience different conditions, and warnings can change quickly.
Safety
Move indoors when thunder is heard or when warnings are issued. Damaging wind and large hail can break windows, damage roofs, bring down trees and power lines, and make travel dangerous.
Official instruction
Seek shelter inside a well-built structure and stay away from windows. These storms are capable of producing damaging winds. Wind damage with these storms will occur before any rain or lightning. Do not wait for the sound of thunder before taking cover. Seek shelter immediately inside a sturdy structure and stay away from windows.
This alert should be updated if the National Weather Service issues, cancels, extends or replaces the active alert. Do not rely on this article alone for emergency decisions. Keep wireless emergency alerts enabled and monitor official NWS, NOAA, local emergency management and trusted local broadcast sources.
Additional Reporting By: National Weather Service; NOAA; National Weather Service St. Louis