Dangerous heat wave in western U.S.

Associated Press
Betty Lu Guapo, 4, cools off in the heat at the Los Angeles Fountain Thursday June 27, 2013 in Los Angeles. California prepared Thursday for a scorching weekend that could see temperatures hit 120 in the deserts as a massive heat wave rolled through the West, authorities said. (AP Photo/Nick Ut)

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Excessive heat warnings will continue for much of the Desert Southwest as building high pressure triggers major warming in eastern California, Nevada, and Arizona.

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