77 million people on alert for life-threatening temperatures as heatwave in northern Maine prompts first-ever heat warning | Latest Weather Clips

77 million people on alert for life-threatening temperatures after heatwave in northern Maine triggers first heat warning

The first major heat wave of the summer in the Midwest and Northeast is underway and has reached record highs. The National Weather Service office in Caribou, Maine, has issued an extreme heat warning, and it is the first such warning the office has ever issued.