An extremely dangerous heat wave is underway for the eastern half of the United States as a potent heat dome reaches its peak, bringing the hottest temperatures of the year so far – the hottest in years for some cities – and putting tens of millions at risk.

An intense and nearly historic weather pattern is cooking much of America in a dangerous heat dome this week with triple-digit heat that hasn’t been seen in some places in more than a decade

Warnings are in place from Missouri and Illinois to Indiana, Ohio and Michigan, where conditions may persist through midweek. Southern Minnesota, Iowa, Nebraska and South Dakota are also expected to see high heat index values, potentially reaching up to 115 degrees in some areas.

Tens of millions of people across the Midwest and East endured dangerously hot temperatures again on Sunday as a sprawling June heat wave gripped much of the U.S.

Tens of millions of people across the Midwest and East are enduring another sweltering day of dangerously hot temperatures as a rare June heat wave grips parts of the U.S.