Europe's Deadly Heatwave: 1,300+ Dead, Trams Melted, and a Second Heat Dome Already Forming

Europe's most severe heatwave in years has killed more than 1,300 people since late June, melted tram infrastructure in Germany, and triggered a continent-wide scramble for air conditioners — and forecasters are already warning of a second, potentially more dangerous heat dome forming for early-to-mid July. The death toll The World Health Organization said more than 1,300 excess deaths have been recorded across Europe since June 21, linked to the extreme heat. WHO Director-General Tedros Adhanom Ghebreyesus said the toll includes children who died in locked cars and young people who drowned while seeking relief in unsupervised swimming spots, warning that "heat stress is often called the 'silent killer' — and European homes, workplaces and schools were not built for these temperatures." France has been hit hardest, with its national health agency recording roughly 1,000 excess deaths since June 24 alone — around 85% of them among people 65 and older — and at least 74 drowning deaths reported nationwide since mid-June. Tedros noted that Europe is warming at roughly twice the global average, making it the fastest-warming continent on Earth, and that "once-in-a-generation" heatwaves are now occurring almost annually. Records falling across the continent Temperature records have toppled in a dozen-plus countries. The Czech Republic hit 41.9°C at Doksany — its highest temperature ever officially recorded. Germany reached 41.7°C near the Polish border, with one town recording an overnight low that never dropped below 29.4°C, the warmest night in nearly 150 years of records. Poland hit 40.5°C, breaking a 105-year-old national record, while Spain's Cantabria region recorded 43.7°C, its highest ever in any month. The UK, Switzerland, and Denmark also broke June records. Infrastructure buckling under the heat The heat has exposed how much of Europe's infrastructure was built for a cooler climate. In Leipzig, Germany, the transit authority suspended the city's entire tram network after joint sealant between the tracks and surrounding asphalt liquefied and clumped inside switches and rails, making safe operation impossible — a similar shutdown hit tram services in Nuremberg. Refrigeration systems failed at several supermarkets, and Poland's national rail operator warned of deformed tracks and sagging power lines, offering refunds on weekend travel. Wildfires broke out in eastern and southwestern Germany, complicated in at least one case by unexploded World War II-era ordnance buried in the affected forest. Electricity prices spiked to record highs in Belgium and the Netherlands as demand for cooling surged. That surge in demand has been dramatic precisely because it's unfamiliar: most European homes were historically built to retain heat through cold winters, not shed it during summer heatwaves, and air conditioning has traditionally been rare. That's now changing fast, with reports of a rush on fans, portable coolers, and air conditioning units in France and elsewhere as residents scramble to adapt to conditions their housing stock was never designed for. The science: what's an Omega Block? Meteorologists have attributed the heatwave's intensity and persistence to an "Omega Block" — a atmospheric pattern in which a dome of high pressure gets sandwiched between two areas of low pressure, roughly forming the shape of the Greek letter Omega (Ω) on a weather map. The high-pressure dome effectively traps hot, sinking air beneath it and blocks the normal west-to-east flow of weather systems, allowing extreme heat to stay parked over the same region for days or weeks rather than moving through. The World Weather Attribution group of scientists has said this heatwave would have been "virtually impossible" this early in the summer without human-caused climate change, and separately estimated that such heatwaves are now roughly 30 times more likely than in the pre-climate-change era.