Twelve thousand five hundred hectares were consumed by flames, and forty-four thousand people were evacuated in just twenty-four hours. When the Gironde prefecture ordered on Friday, July 24, the complete evacuation of the Cap-Ferret peninsula, it merely confirmed what the SDIS 33 firefighters had observed on the ground since the previous evening: this fire, which had started on Wednesday near Saumos, had tipped into a category that even the 2022 veterans had never seen. The blaze’s speed of propagation forced it to burn “800 to 1,000 hectares per hour in a context of an urban-peripheral zone,” described General Controller Marc Vermeulen, head of the Gironde Fire and Rescue Service. A pace that makes any traditional containment strategy seem ridiculous.
To Remember
- Why could a fire burn 1,000 hectares per hour with no one able to stop it?
- What is pyroconvection and how does it turn a fire into an unstoppable force?
- How does one evacuate 44,000 people from a peninsula in only a few hours?
A Fire That Spreads Faster Than People
The regional prefect, Sophie Brocas, found the words to describe the indescribable. She said it was an “XXL” fire, capable of leaping by up to a kilometer and voracious in its appetite, which wiped out 12,500 hectares of forest. A leap of one kilometer, in concrete terms, means glowing embers being hurled from the smoke columns well beyond the visible front, igniting new spots where no one expects them. Crews along a defensive line suddenly found themselves surrounded by a fire that had surged behind them. That is exactly what happened that night: around 1 a.m., despite the mobilization of the firefighters, the blaze crossed the reinforcement line meant to slow its advance.
This phenomenon has a technical name among forest-fire specialists: pyroconvection. An intensely hot fire generates its own weather, with columns of hot air rising, drawing in surrounding oxygen, and then dropping back in unpredictable swirls. The fire no longer merely follows the wind; it makes its own wind. The result? Forecasts of spread, usually calculated in hours, become obsolete in a matter of minutes. Despite a fierce, relentless battle by about a thousand firefighters, the night from Thursday to Friday felt like an inferno, in a situation considered “worse” than the mega-fires of 2022, summarized Marc Vermeulen. A line that, coming from a man used to the worst summers in the Médoc, is a red alert.
The Wind Shifts, the Dry Thunderstorm Looms
Add to this mechanism a factor no one can fully control: the weather. The head of SDIS 33 spoke of a “grave concern as the wind would swing to the west with gusts that could reach 80 km/h, if these winds were combined with dry thunderstorms according to Météo-France.” A dry thunderstorm is the worst possible update for a fire already out of control: lightning strikes without rain to accompany them, capable of igniting new fire starts miles from the main blaze, while 80 km/h gusts shift the front’s direction in minutes.
For firefighters on the ground, this kind of shift forces a complete real-time reassessment. A defense line built to halt a southern-approaching fire becomes useless if the wind veers west in the middle of the night. This is precisely what prompted the prefect to act decisively: “We feared it—the big XXL fire, unpredictable, making 1-kilometer leaps and voracious,” described Sophie Brocas during a press briefing. “At midnight, this fire suddenly roared. My priority is to protect lives and people, so I ordered the evacuation of the peninsula and Le Porge in the dead of night.” A decision made in the dead of night, with no time for reflection, because the fire itself offered none.
800 Firefighters, Canadairs, and Yet It Isn’t Enough
On paper, the deployed arsenal was colossal. More than 800 firefighters were on the ground, supported by 260 ground rescue resources and six aerial assets comprising one Dash, two Canadairs, two Air Tractors, and the helicopter Charlie33. In addition, 440 gendarmes were mobilized to manage evacuations. And yet, this setup, designed in the wake of the historic fires of 2022, was overwhelmed by the speed of the blaze. The material and human toll speaks to the scale of the derailment: 53 houses and a campsite burned, while 42 firefighters were injured and treated, including nine evacuees, all in relatively urgent condition.
The challenge wasn’t solely the number of hectares. It lay in the very nature of the affected area, straddling the Landes pine forest—one of France’s most combustible—and the dense urban outskirts around the Arcachon basin. A fire advancing at a thousand hectares per hour in such a mosaic forced Canadairs and Air Tractors to make impossible choices: where to drop water first when everything is burning at once? The “biggest fire of the season” kept raging violently in Gironde, according to the interior minister. Laurent Nuñez announced on Friday, July 24, that the Arcachon basin fire, which began in Saumos on Wednesday, remained “not under control.”
An Entire Peninsula Evacuated in a Few Hours
The evacuation of Cap-Ferret will stand as a textbook case of crisis management under extreme constraints. Tens of thousands of residents and tourists were ordered to depart from 4 a.m., leaving the area via a single road axis and marshalling boats in the morning to head to the mainland. A peninsula accessible by a single road artery, during peak tourist season, with tens of thousands needing to depart before the fire cut off the only exit: the coastal prefect’s nightmare scenario. Navigation in the Arcachon basin was temporarily halted to secure the maritime operation.
In the wake of this, the prefecture pressed on. Further evacuations were underway in Andernos, Arès, Le Temple, and Saumos, confirmed Sophie Brocas, evidence that the front remained active across several communes at once. As a precaution, residents of the Les Tchanqués nursing home in Lège-Cap-Ferret were also relocated to suitable facilities—a reminder that behind the burned-hectare figures are elderly and vulnerable people who must be moved urgently, not just secondary homes.
What stands out, ultimately, is the operational discipline that persisted despite the apparent chaos. Throughout the day, several new fire starts required the immediate deployment of aerial assets to other parts of the department, in line with the operational strategy of prioritizing nascent fires to prevent their spread. The Canadairs and the Dash did not remain fixed on the main blaze: they jumped from one start to another, even if that meant temporarily leaving the Saumos blaze to its own devices, betting that extinguishing a nascent fire costs less in hectares and lives than allowing a second XXL blaze to take hold elsewhere in Gironde.
Sources: jeanmarcmorandini.com | france3-regions.franceinfo.fr
