Understanding the Heat Dome Over Europe

Europe is currently facing its second major heat wave of the year, with temperatures reaching near-record highs in countries like Britain, Spain, and France. This extreme weather is caused by a heat dome, a significant meteorological phenomenon.

What is a Heat Dome?

A heat dome is a vast, persistent zone of high pressure in the upper atmosphere. It traps heat over an area for several days or more. These systems can occur anywhere in the world and act like a lid, preventing the warm air near the Earth’s surface from rising and forming clouds.

Effects of a Heat Dome

The lack of cloud cover leads to more sunlight hitting the ground, which increases temperatures day after day. The Royal Meteorological Society in Reading, England, compares it to a lid on a pot, illustrating how the high-pressure system suppresses rising air and limits cloud formation.

France’s weather service, Météo-France, notes that these high-pressure systems can also block or redirect weather fronts. This leads to conditions with minimal clouds and rain.

These prolonged periods of heat pose significant challenges. People find ways to cope, such as using umbrellas for shade, as observed in Spain during the country’s first official heat wave of the season.