18 heat deaths, 40 drownings: When will Europe's deadly weather improve?

France has recorded at least 18 direct heat deaths and 40 drownings since June 18 as an Omega Block traps hot Saharan air across Europe. Temperatures are expected to peak on June 25 and 26, with some regions touching 45 degrees Celsius before any relief arrives.

In Short

• France records 40 drownings as desperate people seek water relief.
• Omega Block locks the jet stream, trapping hot Saharan air.
• Europe's heatwave is two to four degrees hotter than it would have been in absence of human-caused warming.

There is a word scientists use for what is happening in Western Europe right now.

Blocking. It sounds calm, almost bureaucratic. It is anything but.

As of June 24, 2026, France has recorded at least 18 direct heat-related deaths, including two young children, aged two and four, found in a hot car in Carpentras in the Vaucluse Department of France.

But the figure that has shaken the country more is a second one: 40 drownings since June 18, mostly young people who waded into rivers, lakes, and unsupervised stretches of coastline looking for relief from temperatures that, in some parts of the country, have climbed past 43 degrees Celsius.

French Prime Minister Sebastien Lecornu confirmed the drowning toll after an emergency crisis meeting. As many as 40 people in six days. Most of them young.

And the heat is not finished yet.

WHAT IS THE OMEGA BLOCK, AND WHY IS IT DANGEROUS?

The answer begins with a shape.

High up in the atmosphere, roughly eight to 16 kilometres above the Earth's surface, there is a fast-moving ribbon of wind called the jet stream.

It flows from west to east, acting as a natural conveyor belt for weather systems across the Northern Hemisphere. Under normal circumstances, it keeps moving, dragging storms, cold fronts, and relief with it.

But sometimes, the jet stream buckles. A bulge of warm, high-pressure air pushes upward into its path, forcing it to curve around rather than cut through. On a weather map, this bulge looks exactly like the Greek letter Omega, the last letter of the Greek alphabet.

Hence, the name: Omega Block.

Think of it as an atmospheric traffic jam. The cars, in this case, are the weather systems, and they have run into a roundabout that refuses to let them out.

The high-pressure bulge locks the atmospheric pattern in place. Two cooler, low-pressure systems sit on either side of it, one typically off the coast of Portugal and another over Central Europe.

Between them, the central high-pressure ridge sits stationary, drawing hot, dry Saharan air northward from North Africa and trapping it underneath itself like a lid on a simmering pot.

That lid is the heat dome.

Clear skies above, no wind to speak of, and air that grows hotter with every passing hour because there is nowhere for the heat to go.

RECORDS ARE FALLING ACROSS THE COUNTRY

France is bearing the brunt of it.

Bordeaux reached 41.9 degrees Celsius, breaking its own local record. Poitiers hit 41.2 degrees. Some areas of central France recorded peaks of 43.3 degrees. Paris touched 38.4 degrees.

The national average temperature for a single day reached approximately 29.2 degrees Celsius, the hottest on record.

Nights offer no relief either. Minimums above 25 degrees Celsius, what meteorologists call a tropical night, have been recorded across broad swathes of the country.

When the night does not cool down, the body never fully recovers from the day.

Meteo-France, the national weather service, has placed roughly 54 of France's 101 departments under red heatwave alert. That is approximately half the country.

Temperatures are expected to peak on June 25 and 26, with some areas potentially reaching 42 to 45 degrees Celsius under conditions of low humidity and occasional gusty winds.

Meteo-France has warned that additional all-time national records, not just June records, could still be broken before the heat dome lifts.

EUROPE IS BURNING FROM END TO END

France is the hardest hit, but it is not alone.

In the United Kingdom, the Met Office has issued a second-ever nationwide heat-health alert, with red alerts in parts of England.

Forecasters have predicted temperatures of up to 39 degrees Celsius in south-east England, which would challenge the existing June record of 35.6 degrees Celsius set in 1976.

Spain, experiencing its first official heatwave of 2026, is recording temperatures of 39 to 42 degrees Celsius in places, with elevated wildfire risk across the peninsula.

Italy has placed red alerts in more than 15 cities, with inland temperatures approaching 39 degrees Celsius.

Across Western and Central Europe, the story is the same: hot air drawn up from North Africa, locked in place by the Omega Block, and building with no outlet.

WHY EUROPE IS LESS PREPARED THAN IT LOOKS

A temperature of 43 degrees Celsius is not unfamiliar to India. Delhi, Nagpur, and dozens of other Indian cities routinely touch and exceed that figure in May and early June.

The infrastructure of daily life, from coolers and air conditioning to the timing of outdoor work, is calibrated around it.

Europe's infrastructure is not.

Home air conditioning is rare across France, Germany, and the UK, not because of poverty, but because of climate history.

Until recently, prolonged extreme heat was not part of the northern European experience, and buildings, schools, and transport systems were designed accordingly.

The result is that a temperature which inconveniences an Indian city shuts down a European one. Reports from Paris describe cooling systems in office buildings in the La Defense district struggling to cope. Schools have closed. Trains have slowed.

The 40 drownings in France since June 18 are a direct consequence of this adaptation gap. With homes and public spaces offering little respite, people have gone to the water, often without supervision, training, or knowledge of currents and depths.

France's 2003 heatwave, the historical benchmark against which every European extreme heat event is measured, killed approximately 15,000 people.

Preparedness has improved considerably since then, with heat-watch warning systems now in place. But the infrastructure deficit remains.

CLIMATE CHANGE MADE THIS WORSE

The Omega Block is not new. Atmospheric blocking patterns have occurred throughout recorded history, and European heatwaves predate the industrial era.

But what science now confirms is that the same atmospheric pattern, sitting over the same geography, produces significantly worse outcomes than it did a century ago.

Europe warms at more than twice the global average rate, according to data from the World Meteorological Organization and the Copernicus Climate Change Service, the European Union's climate monitoring body.

The current heatwave is estimated to be two to four degrees Celsius hotter than it would have been in the absence of human-caused warming. The global average temperature has already risen approximately 1.3 degrees Celsius above pre-industrial levels.

In practical terms, this means the blocking pattern that once produced a hot but survivable week now produces a potentially lethal one. The shape of the jet stream has not changed. The temperature it traps underneath has.

May 2026 was already marked by early and unusual heat across parts of Europe. The June event was not an isolated surprise. It was part of a pattern.

WHAT WILL HAPPEN NEXT?

Meteo-France and the UK Met Office are both forecasting a gradual easing of conditions from Saturday, June 27 onwards, as the Omega Block slowly weakens and the jet stream begins to reassert its normal westerly flow.

But gradual is a word which does a lot of work in that sentence because the heatwave conditions are severe.

Even as the pattern weakens, temperatures will remain oppressive through the end of the week. The heat dome does not vanish overnight. It subsides, slowly, while the accumulated heat in soil, buildings, and urban infrastructure dissipates over days.

French health authorities are maintaining their red alerts. Strong advisories have been issued against swimming in unsupervised water bodies. Cooling centres in public buildings, libraries, and community halls remain open.

And somewhere over the Atlantic, the jet stream is beginning its slow, uncertain return.

For the people waiting under the lid, it cannot come soon enough.

- Ends