These unbearably hot and humid summer months that put millions of people across the globe at risk are typically made possible by phenomena known as heat domes.

These unbearably hot and humid summer months are typically made possible by phenomena known as “heat domes.”

These unbearably hot and humid summer months that put millions of people across the globe at risk are typically made possible by phenomena known as heat domes.

Estos sistemas de alta presión retienen el calor y la humedad: aquí lo que debes saber

Heat domes trap overnight temperatures too — and millions without air conditioning are facing this week's Eastern U.S. heat wave.

Heat-trapping high pressure systems can sit over an area for a week or longer

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A dangerous heat dome has enveloped the Midwest, South and East Coast, bringing prolonged extreme heat to more than 30 states this week.

The heatwave will likely see record high temperatures, ahead of Fourth of July celebrations and FIFA matches in the US.