Chicago officials released heat alerts. A heat dome drove temperatures above 100 degrees this week. This is harmful for kids, the elderly, and pets. Drink water and remain inside. Libraries and police stations are open as cooling centers. They provide safe, air-conditioned protection. Authorities want neighbors to look after those who are vulnerable. People without AC or medical care face the greatest risks. The hot weather will linger several more days. If someone shows signs of heat exhaustion, call for assistance now. Never wait. Time is critical.