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Western US states are baking in an extended heatwave, with temperatures threatening to break the all-time high recorded on Earth. Cities in the region are opening cooling centres and officials fear the heat could delay air travel. Most large aircraft can operate in temperatures up to 52C, but readings as low as 47C could affect lift-off conditions.
A US Airways spokesman said the airline would be monitoring temperatures in Phoenix "very closely". Michael Fedo of Scottsdale, Arizona, told the BBC his family was spending less time outdoors as the temperature rose and that he had taken to shopping for food in the middle of the night. But when it goes above 45C it hurts to breathe. The heat sucks the energy from your core. The National Weather Service has issued a heat warning for several parts of the region, including Las Vegas, until Monday morning. Parts of five states including Colorado and Utah will see temperatures higher than 37C over the weekend.
Temperatures in Death Valley in the California desert are forecast to reach 53C over the weekend. The hottest air temperature ever recorded on Earth, 57C, was marked there almost years ago on 10 July Weather officials say the extreme weather is caused by a high-pressure system stuck over the area.
Scientists say the North American jet stream, the path of air that influences weather patterns, has become more erratic in the past few years, making weather systems more likely to become stuck in place. But they disagree on whether global warming is the cause of the jet stream's behaviour. The US Border Patrol's search, trauma and rescue unit has added extra personnel this weekend as the threat of exhaustion and dehydration rises for those attempting to cross the US-Mexico border illegally on foot.
At least seven migrants were found dead in Arizona's desert last week in lower temperatures. Border officials in Tucson, Arizona, rescued more than people suffering from the heat during a day period in May and June.
Utility officials planned to monitor electricity usage closely over the weekend but were not immediately concerned about overlo. And zookeepers at the Phoenix Zoo were expected to keep outdoor animals chilled with water hoses and concrete slabs cooled by internal water-filled pipes.
In pictures: US heat wave. The heatwave is expected to last through the weekend. More on this story. Published 29 JuneBbc need sucked in Utah
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Western US states baked by blistering heatwave