<br /> More than half of the mainland United States has been engulfed by extreme temperatures and high humidity this week.<br />The National Weather Service has said the “widespread and dangerous” heatwave will continue into the weekend.<br />The heat index, a measurement of how hot it feels when accounting for humidity, is expected to soar to 110 degrees Farenheit in many cities.<br />According to HuffPost, as of Thursday, 154 million Americans were under heat advisories or warnings. <br />
