Tens of millions across the Midwest and East are facing dangerously high temperatures this week as a massive "heat dome" settles over the region. With heat advisories in effect from Minnesota to Maine and triple-digit temperatures reported in some areas, Weather Service officials warn of life-threatening conditions that could last through Wednesday. Dr. Jim Seibert, meteorologist with WeatherNation, joins to explain what a heat dome is, how unusual this early-season heatwave is, what to expect in the coming days, and how people can stay safe in the extreme heat.

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