The National Weather Service has issued an excessive heat warning for much of the southwestern United States, as temperatures climb to near-record levels.
Forecasters say the thermometer could hit 54 degrees Celsius in Death Valley, California. Death Valley is the site of the hottest temperature ever recorded on Earth - 57 degrees Celsius in 1913.
Authorities in such large cities as Phoenix and Las Vegas say the weather could be life-threatening for those at the highest risk, including children and the elderly.
They urge everyone to take precautions, such as limiting outdoor work, wearing loose-fitting clothing, and drinking plenty of water.
Meteorologists blame the extreme temperatures on a massive high pressure system trapping desert heat.
Forecasters say the thermometer could hit 54 degrees Celsius in Death Valley, California. Death Valley is the site of the hottest temperature ever recorded on Earth - 57 degrees Celsius in 1913.
Authorities in such large cities as Phoenix and Las Vegas say the weather could be life-threatening for those at the highest risk, including children and the elderly.
They urge everyone to take precautions, such as limiting outdoor work, wearing loose-fitting clothing, and drinking plenty of water.
Meteorologists blame the extreme temperatures on a massive high pressure system trapping desert heat.