Millions in US To Experience, Extreme Heat Advisories , Through the Weekend.<br />According to reports, at least 85 percent <br />of people living in the U.S. will experience <br />temperatures of 90 degrees Fahrenheit or higher.<br />On July 21, heat advisories extended to more than 100 million Americans.<br />Widespread high temperatures in the mid-to-upper 90s and low 100s will encompass a majority of the country on Thursday <br />and Friday, National Weather Service, via CNN.<br />The extreme heat extends from the Southwest to the Northeast.<br />Experts expressed <br />concerns about the <br />high temperatures.<br />Those numbers are what we would expect to see in mid- to late-August, Adam Paluka, Emergency Medical <br />Services Authority, via CNN.<br />So we're four to six weeks ahead of where we would normally see those mid-200 call numbers, Adam Paluka, Emergency Medical <br />Services Authority, via CNN.<br />It's very concerning, Adam Paluka, Emergency Medical <br />Services Authority, via CNN.<br />Especially because the amount of patients that are being transported indicates that some of those calls are heatstroke, which can be deadly, Adam Paluka, Emergency Medical <br />Services Authority, via CNN.<br />In cities such as Austin, TX, officials are imploring <br />the public to do what they can to mitigate <br />the chances of energy blackouts.<br />We're asking people to conserve power so that the systems continue to operate, Steve Adler, Austin Mayor, via CNN.<br />In addition to health concerns, officials say extreme temperatures represent an economic crisis.<br />That is not only concerning to people's health but their pocketbooks [...] People can't afford this AC, the higher electricity cost. It's both a health and an economic crisis, Jane Gilbert, Chief Heat Officer of <br />Miami-Dade County, via CNN