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Extreme heat events are characterized by high temperatures combined with high humidity, creating dangerous heat indices that can reach 105-110°F, making outdoor conditions nearly unbearable. The most dangerous aspect is the lack of overnight breaks, as temperatures often don't drop below 80°F, preventing natural cooling of homes and bodies. This creates significant strain on power grids as air conditioning systems operate continuously, leading to power outages. Communities provide cooling centers, with recreation centers in Detroit serving as free, open-late-into-the-evening locations. During extreme heat, people should stay hydrated, check on vulnerable neighbors, limit outdoor activities, and be aware of those without working air conditioning.