West enters Day 7 of heat wave as experts warn not to walk barefoot on hot asphalt

Tens of millions of Americans are under record-setting heat alerts again Friday as a heat wave enters its seventh day across the West, with experts warning against walking on asphalt barefoot or touching car handles barehanded for fear of third-degree burns.

Temperatures in Arizona, Nevada and Colorado soared into the 90s and 100s Thursday, but the sizzling heat also spread east to Nebraska, Kansas and Iowa, breaking record after record where observed highs were sweltering by late spring standards.

Tucson, Arizona, Phoenix and Las Vegas all topped their previous records with temperatures above 110.