A high-pressure weather system could bring record-breaking temperatures to central and eastern parts of the United States this week, National Weather Service forecasters said on Monday, threatening a large swath of the country with multi-day excessive heat. Some 80 million people are currently under a heat advisory or warning as heat is expected to surpass 90 degrees Fahrenheit (32.2 degrees Celsius) and flirt with 100 degrees in some areas, which is 20 degrees above average this time of...