A potentially deadly heat wave is expanding from the Central U.S. to both coasts, with 104 million people under heat warnings and advisories early Friday.
The extreme heat poses an acute public health risk, particularly since it will last more than a week in some places.
It will also cause an uptick in fire risks in the West, where large, fast-moving and deadly wildfires are already burning.
As a strong area of high pressure aloft, or heat dome, intensifies and stretches its influence across the Lower 48 states, cities from Washington to Sacramento could near or surpass 100°F as early as Friday.
The heat is forecast to persist the longest in the West, where the National Weather Service shows at least some risk of extreme heat through Aug. 10.
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