An extreme heat wave gripping the western United States will intensify and spread this week, creating dangerous conditions amid the worst drought in the last two decades and raising concerns about severe wildfires and electrical grid failures.

More than 40 million people in the country are forecast to experience triple-digit temperatures this week and roughly 200 million people are projected to see temperatures over 90 degrees. More than three-fourths of the West is in severe drought, according to the U.S. Drought Monitor.

Temperatures in some areas could surpass 120 degrees Fahrenheit and excessive-heat warnings are in place for several states. Nevada and Arizona are forecast to see record temperatures of 125 and 128 degrees, respectively.

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