Temperatures are expected to soar across Utah and into Wyoming and Idaho, with triple-digit heat forecast for the Boise area. Cities in Washington state that are better known for cool, rainy weather should break the 90s next week.
Tourists stay close to misters to keep cool
Tourists stay close to misters to keep cool as they walk along The Strip in Las Vegas during a heat wave. (June 27, 2013) (Credit: AP)
Tourists watch the Bellagio fountain show during a
Tourists watch the Bellagio fountain show during a heat wave in Las Vegas. (June 27, 2013) (Credit: AP)
Bess, an orangutan at the Phoenix Zoo, keeps
Bess, an orangutan at the Phoenix Zoo, keeps cool under a wet sheet and a hose in Phoenix. (June 28, 2013) (Credit: AP)

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Jai, a tiger at the Phoenix Zoo, breaks
Jai, a tiger at the Phoenix Zoo, breaks apart frozen trout while sitting in his pool to keep cool in Phoenix. (June 28, 2013) (Credit: AP )
Ten-year-old Easton Martin, of Mesa, Ariz., stops to
Ten-year-old Easton Martin, of Mesa, Ariz., stops to cool off in a misting fan while walking along The Strip with his family in Las Vegas. (June 28, 2013) (Credit: AP )
Cheng Jia, of China, by a digital thermometer
Cheng Jia, of China, by a digital thermometer at the Furnace Creek Visitor Center in Death Vally National Park in Furnace Creek, Calif. (June 28, 2013) (Credit: AP )
Michael Jackson impersonator Juan Carlos Gomez drinks some
Michael Jackson impersonator Juan Carlos Gomez drinks some water as he takes a break from posing for photos with tourists along The Strip in Las Vegas. (June 28, 2013) (Credit: AP )
David Reyes, left, and Shavaar Hanes take a
David Reyes, left, and Shavaar Hanes take a break from posing for photos with tourists as the Mario Brothers along The Strip in Las Vegas. (June 28, 2013) (Credit: AP )

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Dan Kail, 67, of Pittsburgh, Pa., walks through
Dan Kail, 67, of Pittsburgh, Pa., walks through the sand dunes in Death Vally National Park Friday near Stovepipe Wells, Calif. (June 28, 2013) (Credit: AP )
Tourists are silhouetted against the distorted Hollywood sign
Tourists are silhouetted against the distorted Hollywood sign from rising heat waves during a major heat wave in Los Angeles, Calif. (June 28, 2013) (Credit: Getty Images)
Heat waves rise and distort Hollywood Boulevard during
Heat waves rise and distort Hollywood Boulevard during a major heat wave in Los Angeles, Calif. (June 28, 2013) (Credit: Getty Images)
Construction worker Joel Loza puts on his bandana
Construction worker Joel Loza puts on his bandana after soaking it in water in an effort to keep cool in Gibert, Ariz. (June 27, 2013) (Credit: AP )
A jet looks like it is melting into
A jet looks like it is melting into the runway as it is distorted by the heat waves rising up from the north runway at Sky Harbor International Airport in Phoenix on the hottest day of the year so far. (June 28, 2013) (Credit: AP )

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Elvis impersonator Cristian Morales wipes sweat from his
Elvis impersonator Cristian Morales wipes sweat from his brow while standing out on The Strip posing for photos with tourists in Las Vegas. Morales preferred to stand out in the 112 degree heat of the day instead of working the cooler evening hours saying "We'd much rather fight with the sun than fight with the drunk people." (June 27, 2013) (Credit: AP )
Construction workers gather at a new home site
Construction workers gather at a new home site at sunrise to beat high temperatures in Queen Creek, Ariz. Excessive heat warnings will continue for much of the Desert Southwest as building high pressure triggers major warming in eastern California, Nevada and Arizona. (June 27, 2013) (Credit: AP )
Betty Lu Guapo, 4, cools off in the
Betty Lu Guapo, 4, cools off in the heat at the Los Angeles Fountain in California. (June 27, 2013) (Credit: AP )
Runners take advantage of lower temperatures at sunrise
Runners take advantage of lower temperatures at sunrise in Mesa, Ariz. (June 27, 2013) (Credit: AP )