London experienced its highest May temperatures in 104 years [1] due to a high-pressure system known as a heat dome.
This weather event highlights the increasing frequency of extreme temperature anomalies in Europe during the spring. The phenomenon occurs when a high-pressure system acts like a lid on a pot, trapping warm air near the surface and preventing it from escaping [1], [2].
According to Nikkei, the heat dome caused unusual warmth across Europe during May 2024 [1]. This atmospheric stagnation allows heat to build up over a specific region for an extended period, which can lead to prolonged and intense heatwaves [2].
Experts said that climate change is a background factor contributing to these shifts in weather patterns [1], [2]. The stagnation of these high-pressure systems prevents the normal flow of cooler air into the region, effectively sealing in the heat [2].
"A heat dome phenomenon is a meteorological event where a wide-area high-pressure system traps heat near the ground, causing extreme heat over a long period," MSN editorial said [2].
Similar patterns have been observed in other parts of the world. Livedoor editorial said that record-breaking heatwaves hitting the U.S. are also partly attributed to the heat dome phenomenon, where high pressure stagnates while acting as a "lid" on warm air [2].
The specific temperature reached in London was not disclosed, but the duration and intensity of the May 2024 event marked a significant historical milestone for the city's climate records [1].
“London experienced its highest May temperatures in 104 years.”
The occurrence of a heat dome in May suggests that extreme summer-like weather is arriving earlier in the year for Northern Europe. As these high-pressure systems become more stagnant and frequent, urban centers like London face increased risks of heat-related health crises and infrastructure strain during months that typically require mild-weather planning.
