An extreme heat wave in the Southwest is pushing temperatures over 115 degrees in Las Vegas and Phoenix. Health officials warn that hot asphalt and sidewalks will blister skin. Forecasters are calling this event “rare, dangerous and deadly.” Climate change and urbanization is making heat waves a growing concern. Scorching surfaces can reach 180 degrees Fahrenheit in the afternoon. It doesn’t take long to fry bare skin. Hospitals usually see an increase in burns during the summer months, but terrible heat waves can make serious, third degree burns more common.