St. Louis, MO – Residents of southern Illinois and northeastern Missouri should prepare for a potentially life-threatening heatwave starting Tuesday afternoon. The National Weather Service has issued an Extreme Heat Watch, with heat index values reaching up to 109°F in some areas.
According to the National Weather Service, the extreme heat will persist through Thursday evening, affecting counties like Greene, Macoupin, Montgomery, and parts of Missouri such as Lewis and Pike. The combination of high temperatures and humidity will make it feel dangerously hot for multiple days.
In addition to the general heat risk, the extended duration of this event will significantly increase the likelihood of heat-related illnesses, including heat exhaustion and heat stroke. The National Weather Service advises residents to avoid outdoor activities during peak heat hours and to take frequent breaks in air-conditioned spaces.
In Illinois, cities like Vandalia, Quincy, and Litchfield will be among the most impacted, with temperatures climbing into the high 90s and low 100s. In Missouri, places like Hannibal and Bowling Green are expected to experience similar conditions.
To stay safe, remember to drink plenty of water, wear loose and light clothing, and check in on vulnerable neighbors or relatives. If you need to be outside, take extra precautions and stay in shaded areas as much as possible.
The heat wave is expected to last through Thursday evening, but residents should be prepared for possible extensions if conditions worsen. Keep an eye on local alerts for updates.
