Millions broil as southern US heat dome causes record highs and wildfires

Millions broil as southern US heat dome causes record highs and wildfires

Extreme heat affecting nearly 23m people across US south-west and pushing Texas’s electrical grid to the limit

A heat dome covering the US’s south-west region is affecting nearly 23 million Americans, bringing with it some of the highest temperatures of the summer and putting pressure on the electrical grid in Texas.

The heat dome phenomenon occurs when strong, high pressure traps hot air over a region, preventing cool air from traveling in and causing temperatures to rise on the ground and stay high.

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