Europe is currently experiencing an intense and early summer heat wave, with millions facing extremely high temperatures. Experts point to a phenomenon known as a heat dome as the primary cause, a condition where high-pressure systems become stationary, trapping heat and humidity.
A heat dome forms due to a northward bulge in the jet stream, a fast-moving air current at high altitudes. This atmospheric bulge causes air to sink and compress, leading to increased pressure and rising temperatures at the surface. "The heat dome is really what the jet stream is doing," explained Jennifer Francis, a climate scientist at the Woodwell Climate Research Center. "The heat wave is what we feel at the surface."
Several European nations, including France, Italy, Spain, and the United Kingdom, are grappling with exceptionally high temperatures, with some forecasts predicting temperatures as high as 104 degrees Fahrenheit (40 degrees Celsius). Liz Bentley, chief executive at the Royal Meteorological Society, noted that June temperature records are not just being broken but "completely annihilated."
This type of extreme heat is becoming more frequent and intense due to climate change, according to experts. "We're warming the globe and that means we're shifting the range of temperatures that any given place experiences," Francis stated. "And as you shift that range of temperature, you're making the extreme temperatures much more likely."
Countries like France, which have less widespread air conditioning compared to other regions, are particularly vulnerable. France has reported approximately 40 fatalities linked to drowning as people sought relief from the heat. The national weather service has issued red heat wave alerts for significant portions of the country.
Authorities have implemented measures to cope with the extreme conditions, including canceling trains, concerts, and sporting events, and restricting public alcohol consumption. A significant concern highlighted by experts is nighttime heat, which prevents the body from cooling down, potentially leading to accumulated health impacts. Finding ways to stay cooler during the night is crucial.
In response to the heat, health officials advise individuals to stay hydrated, avoid strenuous activity during the hottest parts of the day, seek shade, and use available water bodies like streams, lakes, or the ocean for cooling, when accessible.