Long and dangerous heat wave to roast America from Dallas to New York through July 4th holiday

A long and dangerous heat wave will blast a large swath of the central and eastern United States this week, the National Weather Service said, with temperatures rising ahead of the July Fourth holiday and feeling even hotter because of the high humidity that’s arriving with it. Already, parts of the U.S., especially Phoenix and central Texas, and much of the Southwest were experiencing temperatures around 100 F (38 C) on Sunday, while the weather service warned of severe wildfire conditions developing across much of the West as new fires popped up across the region. On Sunday, well over 130 million Americans across southern and Great Plains states were under moderate to severe heat risk conditions, according to weather service maps, with that area forecast to expand and temperatures to intensify as the week drags on. Forecasters say several days of high temperatures — some above 100 degrees F — will settle in across the lower Great Lakes, the mid-Atlantic and the Mississippi and Ohio River valleys. Some record highs could be set in areas from the lower Great Lakes to the mid-Atlantic and New England later in the week, said weather service meteorologist Bryan Putnam. A number of big cities could see their highest temperatures of the year so far as they host World Cup matches and celebrations for America’s 250th anniversary. Feeling the heat will be the East Coast cities of New York, Philadelphia, Washington and Baltimore, and Midwestern and Great Lakes cities including Chicago, Indianapolis, St. Louis and Detroit. Southern cities including Dallas, Little Rock, Arkansas, and Memphis, Tennessee, will also see high temperatures. High heat will last into next weekend across the Great Plains, the Southeast and the mid-Atlantic, the weather service said. Temperatures will reach well into the 90s and low 100 degrees Fahrenheit (mid to high 30s Celsius), the weather service said. High humidity will lead to heat indexes of 100 to 110 degrees F (40 C to 43 C), and as hig