Heat dome traps California under extreme temps, brings scorching record highs to Southwest

Much of California and the Southwest will swelter under extreme heat on Thursday in a wave that's forecast to bring widespread record high temperatures. Twenty-seven million people are under heat warnings and advisories today, as a heat dome essentially traps warm air from the Golden State down to southern Texas. A major concern will be California’s Central Valley and the Desert Southwest “due to their lower elevations and some urban areas,” according to the National Weather Service.

On Thursday, Phoenix is forecast to hit a whopping 113 degrees; Las Vegas may reach 112; and Death Valley, California, could be at 121 on amid the extreme heat wave. By Friday, the heat wave will expand north into Oregon and Washington on Friday and Saturday, and ease Sunday across the Southwest. Heat will also impact the Florida peninsula from Thursday into the weekend with several high and low temperature records forecast to be tied or broken from Jacksonville down to Tampa and Miami.

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