Extreme Heat Warning Issued for Portions of Missouri and Illinois
The alert level has been raised to an Extreme Heat Warning through 9:00 p.m. on August 16, 2026.
3 reports on this incident · first at Aug 16, 2026, 6:42 p.m. ET
Hazard products are revised and cancelled as conditions change. Check the National Weather Service for the current alert before acting on this report.
Earlier reports
Aug 16, 2026, 6:50 p.m. ET
NWS Warns Heat Illnesses Will Increase Significantly in Illinois and Missouri
Heat-related illnesses increase significantly during combined extreme heat and high humidity, the National Weather Service warned on August 16, 2026. The risk accompanies an Extreme Heat Warning issued by the National Weather Service office in St. Louis for portions of south central and southwest Illinois, as well as central, east central, and southeast Missouri.
The warning covers dangerously hot conditions with heat index values up to 109. The alert remains active until it expires at 9:00 PM on August 16, 2026.
Recommended precautions include drinking fluids, staying in air-conditioned spaces, staying out of the sun, and checking on relatives and neighbors.
Aug 16, 2026, 6:42 p.m. ETFirst report
National Weather Service Issues Extreme Heat Warning for Missouri and Illinois
In a developing situation on August 16, 2026, the National Weather Service office in St. Louis issued an Extreme Heat Warning, medicaldaily.com reported. The warning covers central, east central, and southeast Missouri, as well as portions of south central and southwest Illinois. Dangerously hot conditions are expected, with heat index values reaching up to 109, according to medicaldaily.com. The warning expires at 9:00 PM on August 16, 2026. Medicaldaily.com reported that heat-related illnesses increase significantly during combined extreme heat and high humidity. Recommended precautions include drinking fluids, staying in air-conditioned spaces, staying out of the sun, and checking on relatives and neighbors.
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Revision history
- Version 116 Aug 2026, 22:50current
First published.
- Version 116 Aug 2026, 22:42current
First published.
- Version 116 Aug 2026, 22:53current
First published.
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