A dangerous heatwave is gripping the central and eastern United States, with temperatures soaring to 105°F as the Fourth of July approaches. Health officials are urging residents to take precautions against heatstroke, a potentially life-threatening condition. Vulnerable populations, including the elderly and those with chronic illnesses, are at particularly high risk. Key recommendations include staying well-hydrated by drinking plenty of fluids, wearing lightweight and light-colored clothing, and recognizing the early warning signs of heat exhaustion. The extreme heat is forecast to persist throughout the holiday weekend, necessitating continued vigilance. Authorities are emphasizing proactive steps to ensure public safety during this heat emergency.