LiveScience: A blast of sweltering heat will sweep across the United States over the next four days, and some places will see temperatures as much as 10 to 15 degrees Fahrenheit (5.6 to 8.3 degrees Celsius) above average for this time of year, according to the National Weather Service.
Hot weather in July is to be expected, of course after all, it's the middle of summer but a so-called heat dome is kicking these hot and humid temperatures up a notch.
A heat dome happens when a "dome" of high pressure...