"Record Heat Dome Scorches Nearly Half of US"

Millions in the US midwest and east are facing extreme temperatures as a heat dome moves across the region, with heat advisories and air quality alerts in place. Near-record temperatures and high humidity are expected, making conditions dangerous, especially for those without adequate cooling. The National Weather Service warns of "major" and "extreme" heat, with relief expected later in the week. Red flag warnings for fire weather and forecasts for flash floods and tornadoes are also in effect in some areas.