77 million on alert for life-threatening temps as heat wave prompts first-ever Excessive Heat Warning in northern Maine

77 million on alert for life-threatening temps as heat wave prompts first-ever Excessive Heat Warning in northern Maine

The first significant heat wave of the summer in the Midwest and Northeast is underway, and it has become record-breaking. An Excessive Heat Warning has been issued by the National Weather Service office in Caribou, Maine, and it’s the first such warning ever issued by the office.