Get ready for some serious summer heat this weekend – more than two thirds of the country will be slammed by a major heat wave through the weekend. A large high-pressure ‘heat dome’ will cover the central and eastern U.S., with the heat index ranging from 105 to as high as 115 in areas ranging from New York to Detroit to St. Louis. Already, more than 55 million people are under heat advisories or excessive heat warnings. Experts warn that the heat can be dangerous or even fatal, especially for the elderly or people with chronic physical ailments. Are you prepared for the summer heat? Would you rather endure a heat wave or a cold snap?