Sweltering Midwest heat cancels outdoor plans as cooling centers open and the East braces

A heat wave in the Midwest has canceled outdoor activities and opened cooling centers, with extreme heat warnings through Tuesday. Temperatures in the 90s and heat indices over 100°F are expected, spreading eastward to the Ohio Valley, Mid-Atlantic, and Northeast by Thursday. Health advisories emphasize hydration and avoiding sun exposure, while Europe also faces heat-related records and deaths.