Heat Dome Blankets Half of US: What to Know for July 4

More than 200 million people are feeling the heat with dangerous and punishing temperatures enveloping the Northeast ahead of the Fourth of July weekend. Forecasters predict several cities could set record highs through the holiday weekend from Detroit to Nashville to Bangor, Maine. NBC’s Ryan Nobles reports and TODAY’s Al Roker tracks the latest forecast. » Subscribe to TODAY:    / @today   TODAY brings you the latest headlines and expert tips on money, health and parenting. We wake up every morning to give you and your family all you need to start your day. If it matters to you, it matters to us. We are in the people business. Subscribe to our channel for exclusive TODAY archival footage & our original web series. Connect with TODAY Online! Visit TODAY's Website: https://www.today.com/ Find TODAY on Facebook:   / today   Follow TODAY on Twitter:   / todayshow   Follow TODAY on Instagram:   / todayshow   » Stream TODAY All Day: https://www.today.com/allday About: TODAY All Day is a 24/7 streaming channel bringing you the top stories in news and pop culture, celebrity interviews, cooking, and more. All in one place. #heat #weather #heatwave