Thunderstorms, Downpours Will Break Down Heat Dome: Here's Timing Two rounds of showers and scattered thunderstorms are poised to hit the Northeast, with back-to-back systems expected to bring ...

Meteorologists say a phenomenon known as a heat dome, a large area of high pressure in the upper atmosphere that traps heat and humidity, is responsible for the extreme temperatures.

Tens of millions of people across the Midwest and East braced Sunday for another sweltering day of dangerously hot temperatures as a rare June heat wave continued to grip parts of the U.S.

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(CNN) — The first of two rounds of extreme heat is underway for parts of the eastern half of the United States, the opening act for a potent and widespread heat dome that will send temperatures to ...

Weather forecasters have warned of extreme and dangerous temperatures as a major heat wave sweeps across the central and eastern U.S. states.