France records first 'thunderstorm fire cloud' amid unprecedented wildfire season

France is grappling with a wildfire season of unprecedented scale, forcing the evacuation of hundreds of thousands and severely impacting its economy during peak tourist season. The fires are behaving in ways not previously recorded in the country, including the formation of a "thunderstorm fire cloud," or pyrocumulonimbus.

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You can think of it like a smokestack.

This rare atmospheric phenomenon forms above intense wildfires when extreme heat lifts smoke and vapor high into the atmosphere, acting like a "smokestack," according to David Bowman, a professor at the University of Tasmania. Jean-Christophe Vinsendon of France's national meteorological service noted that while meteorologists can identify conditions conducive to these clouds, predicting their exact formation remains difficult.

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A thunderstorm fire cloud represents a truly unique situation where the fire is so intense that it changes the atmospheric behavior above it.

Pyrocumulonimbus clouds are more unusual than standard pyrocumulus clouds. They require significant additional heat to reach the great heights necessary for their formation, explained Jason Sharples, a professor at the University of New South Wales. These "fire clouds" can escalate wildfire dangers by generating strong winds that alter fire paths or producing lightning that sparks new blazes. They can also cause a "smoke column collapse" when they lose energy.

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These are clouds like the cumulus clouds we see every day, those small, white, fluffy clouds. For a pyrocumulonimbus to form, the cloud must reach a much greater height, and that requires additional heat.

French authorities reported a pyrocumulonimbus near Bordeaux on July 25, marking the first such observation in France. This poses an additional challenge for emergency services, as the unpredictable nature of these fires can necessitate expanded evacuation zones, according to Marc Vermelen, director of the Gironde fire and rescue service. Bowman linked the occurrence of pyrocumulonimbus and intense wildfires in Europe to climate change, stating that the current fire crisis is undeniably connected to record-high temperatures. He emphasized the need to stabilize the climate.

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There is no doubt that the fire crisis we are witnessing in Europe is linked to extremely high temperatures, unprecedented in history.