The metro Phoenix area is on track to tie or to break a record set in the summer of 1974 for the most consecutive days with the high temperature at or above 110 degrees Fahrenheit (43 Celsius).
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Las Vegas and other areas of the Southwest are bracing for a week of scorching temperatures. Physicians are warning people to know the signs of heat illness.
From heavy sweating and dizziness to muscle spasms and even vomiting are some of the signs. Heat illness can be avoided by staying in and drinking water.
The Southwestern U.S. is bracing for another week of blistering temperatures, with forecasters on Monday extending an excessive heat warning through the weekend for Arizona's most populated area, and alerting residents in parts of Nevada and New Mexico to stay indoors.