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Extreme heat warning
Archived — this story has rotated out of today’s deck. It is kept here in full.
The gist
Extreme heat warnings hit the Heartland, Kansas City, and Chicago, with heat indexes topping 105°F.
The warnings force schools and festivals to adapt, posing health risks to vulnerable people.
Background
A prolonged heatwave has settled over the central and midwestern U.S., with a high-pressure ridge trapping hot, humid air. The National Weather Service has issued extreme heat warnings for areas including the Heartland, Kansas City, and Chicago, where heat index values are expected to reach or exceed 105°F. These conditions increase the risk of heat-related illnesses, especially for those spending time outdoors or without air conditioning.
How it unfolded
- Sep 2, 2026Extreme heat warnings are in effect for the entire Heartland, with air temperatures between 95 and 100°F and feels-like temperatures around 105°F.
- Sep 3, 2026Chicago Public Schools cancels outdoor activities due to the heat, but later reinstates them after the warning is lifted. An extreme heat warning remains in effect for Cook County until 7 p.m.
- Sep 4, 2026Kansas City remains under an extreme heat warning through Tuesday evening, with outdoor festivals continuing despite the heat.
Who’s saying what
- Official
- The National Weather Service warns that dangerous heat and humidity can lead to heat exhaustion and heat stroke, urging people to stay hydrated and take breaks in air conditioning.
- Public
- Cammy Whalen of KC Ren Fest says attendees should plan to stay hydrated and take breaks, adding that they can still have a great time even with the heat.