A dangerous heat wave, fueled by a massive heat dome, has enveloped millions across the Midwest and Northeast, causing road buckling and travel disruptions. With temperatures expected to soar to levels not seen in years, record-breaking highs are anticipated, including possible triple-digit readings in major cities such as New York and Boston. Federal officials have issued health warnings as nearly 160 million Americans are under heat alerts, urging residents to stay indoors as oppressive conditions persist. The extreme heat not only threatens health but also comes with risks of severe storms, adding to the unsettled weather. Forecasters are closely monitoring the situation as the heatwave shows no signs of letting up, with more record highs expected in over 250 cities this week.