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France has experienced its first "fire cloud". What is it exactly?

France is coping with a fire season unprecedented in its history. It has forced hundreds of thousands to evacuate and dealt a major blow to the country's economy at optimum tourist season.

It's not only the?scale?of the fires?that?is a?first. The fires are also acting in a way that has never been seen in France before, such as the first ever reported pyrocumulonimbus or "fire cloud".

Here is an overview of this rare phenomenon.

What is a 'fire-cloud'?

A pyrocumulonimbus cloud is formed when intense heat drives smoke, ash, and water vapour into the air.

David Bowman is professor of pyrogeography at the University of Tasmania. He said that you can imagine it like a 'chimney, where there is a fire on the bottom, and the smoke goes straight up the 'chimney to the stratosphere.

Jean-Christophe Vincendon is the wildfire coordinator at France's national meteorological service. He said that while meteorologists can identify conditions which favour fire clouds, they are unable to predict when or where one will form.

How do they worsen wildfires?

Wildfires are made more unpredictable and dangerous by fire-clouds, which can cause them to be less predictable. They do this by creating powerful winds that change the direction of a fire or producing lightning to ignite new flames.

They can also cause a "plume collapse" when they run out energy.

Bowman said that when the plume collapses it is a "showering of debris and burning debris".

What does this mean for Europe?

The French authorities announced on Saturday that a pyrocumulonimbus, the first ever recorded in France, had been observed near Bordeaux.

Marc Vermeulen is the head of Gironde Fire and Rescue Service. He said that the phenomenon poses a challenge to emergency services due to the unpredictable nature of fires.

Bowman says that Western Europe can expect to see this phenomenon more often, as it tends to occur in larger wilderness areas such as Canada or Australia.

Bowman stated that "this is a grave milestone." "It's fascinating, but also absolutely terrible and horrible, and we don't want to see more of this." (Reporting and editing by Gabriel Stargardter, Ros Russell and Coralie Lamarque)

(source: Reuters)