The Southwest is in for peak dog days as a looming heat wave has triggered extreme heat warnings and advisories for 80 million people from the U.S. - Mexico border to southwest Utah .

Federal forecasters said a swirling system of warm, descending air over the crosshairs that divides Arizona , Utah, Colorado and New Mexico will toast the region through the weekend.

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“An anomalously strong ridge of high pressure centered over the Four Corners states will lead to a significant heat wave,” the National Weather Service said in a national forecast discussion Tuesday.

Extreme heat warnings, which predict certain danger, begin Wednesday morning in Southern California for parts of Los Angeles , San Diego and

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