Dangerous summer heat wave threatens 70 million people across US
03:14
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At least 12 states are facing triple-digits temperatures as the first major summer heat wave of the year sweeps across the country, sparking wildfires in California and Arizona. NBC’s Janet Shamlian reports that there is a huge strain on the power grid in the Southwest as excessive heat warnings begin to go into effect. (Run time: 3:14)June 17, 2016
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