The National Weather Service forecasts a peak of 126 in Death Valley, California. Phoenix, Arizona, expects a high of 117 on Sunday, and Las Vegas, Nevada, is preparing for weekend highs of 113.
In the southwest, “we take advantage of the so-called heat risk,” said Marvin Percha, a meteorologist with the National Weather Service. This differs from other regions of the country where heat indices play a greater role in heat warnings.
“We look at how rare the event is and compare what is normal,”
The heat in Phoenix this weekend could break daily records. The expected Phoenix high of 117 on Sunday would exceed the July 12, 115 daily record of 2009. The heat in California and Nevada will be close to the records, but will not quite reach them.
High heat is seasonally appropriate for the region, but usually not as high as long.
Such high temperatures can be intensified in valleys and on the ground, where materials can start to melt.
High temperatures can be dangerous and people in affected areas are asked to take safety precautions. “Everyone with heart or diabetes problems should be extra careful and do their best to really stay away from it,” said Percha.
“If you need to be outside, try to limit your exposure and keep yourself well hydrated,” Percha said. “Look for air-conditioned cooling centers if you have to.”