PHOENIX (AP) — Doctors who work in Arizona and Nevada burn centers are warning of injuries from contact with super-heated roadways and other surfaces as the first extreme heat wave of the year extends across the U.S. West.

A high pressure system is expected to push temperatures above 115 degrees Fahrenheit (46 Celsius) this week in Las Vegas and Phoenix. Health officials advised people to be mindful of hot asphalt, sidewalks and even desert sand.

Elsewhere, heat warnings stretched from California’s central and inland valleys to as far north as Montana and Wyoming, where predicted highs of 109 degrees (43 Celsius) on Tuesday are expected to shatter records. In Denver, parents, kids and pets cooled off in a popular creek Monday as the temperature hit 96 degrees (36 Celsius) by mid-afternoon.

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