At least 90 million Americans are under heat alerts as temperatures surge in many regions of the U.S. Officials are advising people to take precautions if they plan to spend time outdoors. Dr. Leigh Vinocur joins "NewsNation Now" to offer some education on identifying signs of heat-related illness. #heatwave #temperatures #summerweather "NewsNation Now" is a no fluff, no filler newscast hosted by Nichole Berlie and Connell McShane featuring up-to-the-minute news drawing from a network of journalists across the U.S. Weekdays starting at 1p/12C. NewsNation is your source for fact-based, unbiased news for all America. More from NewsNation: newsnationnow.com Get our app: trib.al/TBXgYpp Find us on cable: trib.al/YDOpGyG How to watch on TV or streaming: trib.al/Vu0Ikij