Chicago, Illinois – A dynamic and potentially dangerous period of weather is set to unfold across northern Illinois and northwest Indiana, beginning with a severe thunderstorm threat that gives way to a significant heatwave this weekend. Residents should prepare for conditions that could include damaging winds, large hail, and isolated tornadoes, followed by oppressive heat and humidity.
According to the National Weather Service in Chicago/Romeoville, a limited thunderstorm risk continues into Wednesday, with a more pronounced threat developing late Thursday afternoon and evening. Some of these storms could become severe, particularly near the Wisconsin border, bringing the possibility of damaging winds and large hail. The primary window for severe weather appears to be focused on late Wednesday and again on Thursday.
As the storm system exits, attention will turn to a building heatwave expected to peak over the weekend. An elevated risk for excessive heat will develop from Saturday through Monday. Peak afternoon heat indices are anticipated to reach near or just above 100 degrees Fahrenheit. This level of heat can be dangerous, especially for vulnerable populations.
Residents are advised to have multiple ways to receive weather alerts as the storm threat evolves. During the weekend heat, limit strenuous outdoor activities, stay hydrated, and check on relatives and neighbors. Ensure cooling systems are in working order before the most intense heat arrives. Warnings and advisories may be issued as the weekend approaches.
Here is the five-day forecast for Chicago:
- Wednesday: High near 76°F. A 90 percent chance of showers and thunderstorms.
- Thursday (Juneteenth): High near 80°F. Mostly sunny.
- Friday: High near 86°F. Mostly sunny.
- Saturday: High near 93°F. Sunny.
- Sunday: High near 94°F. Mostly sunny.
