Terri Patterson cools off at a water fountain in Salt Lake City on Wednesday, June 21. <a href="http://www.cnn.com/2017/06/20/us/weather-west-heat-wave/index.html" target="_blank">A punishing heat wave</a> is breaking records in parts of the western United States, causing massive power outages and flight cancellations.
Terri Patterson cools off at a water fountain in Salt Lake City on Wednesday, June 21. A punishing heat wave is breaking records in parts of the western United States, causing massive power outages and flight cancellations.
Rick Bowmer/AP
A fan is pointed at a dog that was rescued from a car in Riverside, California, on June 21.
A fan is pointed at a dog that was rescued from a car in Riverside, California, on June 21.
John Welsh/AP
Xaviere Coleman pours water over his head in Las Vegas on Tuesday, June 20. He was wearing a Chewbacca costume to take photographs with tourists on the Strip.
Xaviere Coleman pours water over his head in Las Vegas on Tuesday, June 20. He was wearing a Chewbacca costume to take photographs with tourists on the Strip.
John Locher/AP
A wildfire burns in Sonoita, Arizona, on June 20.
A wildfire burns in Sonoita, Arizona, on June 20.
Ann Alden/AP
A woman shields herself from the sun while walking along the Las Vegas Strip on June 20.
A woman shields herself from the sun while walking along the Las Vegas Strip on June 20.
John Locher/AP
A construction worker drinks water at a job site in Phoenix on June 20.
A construction worker drinks water at a job site in Phoenix on June 20.
Ralph Freso/Getty Images
Eric Maurice Clark sells cold drinks to motorists at a busy intersection in Phoenix on June 20.
Eric Maurice Clark sells cold drinks to motorists at a busy intersection in Phoenix on June 20.
Ralph Freso/Getty Images
A pedestrian in Phoenix uses an umbrella to get some relief from the sun on June 20.
A pedestrian in Phoenix uses an umbrella to get some relief from the sun on June 20.
Ralph Freso/Getty Images
Morgan Reed, a promotions assistant for the Phoenix radio station KSLX, plays with a puppy wearing elastic booties at a PetSmart in Tempe, Arizona, on June 20. The radio station handed out the booties to protect dogs' paws from the hot pavement.
Morgan Reed, a promotions assistant for the Phoenix radio station KSLX, plays with a puppy wearing elastic booties at a PetSmart in Tempe, Arizona, on June 20. The radio station handed out the booties to protect dogs' paws from the hot pavement.
Angie Wang/AP
A construction crew sits under their excavator during a break in Tempe on June 20.
A construction crew sits under their excavator during a break in Tempe on June 20.
Matt York/AP
Jennifer Boushy, left, and Jennifer Rellinger cool off their pets at a dog park in Las Vegas on June 20.
Jennifer Boushy, left, and Jennifer Rellinger cool off their pets at a dog park in Las Vegas on June 20.
John Locher/AP
An American Airlines grounds crew member sits in a luggage cart to avoid the heat in Phoenix on June 20.
An American Airlines grounds crew member sits in a luggage cart to avoid the heat in Phoenix on June 20.
Matt York/AP
Boys cool off with water guns in downtown Los Angeles on Monday, June 19.
Boys cool off with water guns in downtown Los Angeles on Monday, June 19.
FREDERIC J. BROWN/AFP/Getty Images
A worker wears a large hat, wet with water, while cleaning seats at Los Angeles' Dodger Stadium on June 19.
A worker wears a large hat, wet with water, while cleaning seats at Los Angeles' Dodger Stadium on June 19.
Jae C. Hong/AP
Volunteer Jackie Rifkin tries to keep cool June 19 at she works at a Salvation Army station to help people stay hydrated in Phoenix.
Volunteer Jackie Rifkin tries to keep cool June 19 at she works at a Salvation Army station to help people stay hydrated in Phoenix.
Ross D. Franklin/AP
Lori Mantz sprays water to cool down her horse Thor in Las Vegas on June 19.
Lori Mantz sprays water to cool down her horse Thor in Las Vegas on June 19.
John Locher/AP
A woman walks through cooling mist in Tempe on June 19.
A woman walks through cooling mist in Tempe on June 19.
Matt York/AP
Construction workers try to shade themselves from the direct sun while welding a steel awning in Los Angeles on June 19.
Construction workers try to shade themselves from the direct sun while welding a steel awning in Los Angeles on June 19.
Richard Vogel/AP