By Thursday, Las Vegas could climb to 111 degrees and Phoenix could hit a scorching 113 degrees.
Doctors stress the seriousness of excessive heat warnings as hundreds die annually in the U.S. due to heat-related causes, a number likely underreported.
CDC advises wearing sunscreen, staying hydrated, limiting outdoor time, checking cars for children, and monitoring high-risk individuals for heat-related illnesses.
Signs of heat-related illnesses include body temperatures over 103 degrees, red skin, fast pulse, headache, dizziness, nausea, confusion, fainting, and cessation of sweating.
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