A great fire has destroyed Lleida. What is a sixth generation fire?
Megasutea in Lleida.
This week's fire in the province of Lleida has changedtherules of the game in the fight against the fire, a sixth generation megasute, a phenomenondirectly linked to the climate emergencythat has killed several farmers and burned thousands of hectares in a few hours.
What's a sixth generation fire?
This kind of fire is much more than the big fires. Autonomous and destructive systems. The problems start when the flames create a powerful column of hot air and smoke. As that column rises, the air gets cold and the moisture condenses, forming a cloud calleda pyrocluster .
In the case of the Lleida fire, the pyrocluster reachedan unusual heightof 14 km . At that height, low temperatures cause ice particles to collide by accumulatingtheelectric charge that is discharged in the form of lightning .
In addition, there is another dangerous effect: sometimes theformation of\u00A0 clouds causes rains. At first glance, it seems good news, but when the drops cross the layersofdry air, they evaporate before they touch the ground. This produces strong downward winds that, instead of extinguishing the flames, spread them faster.
The President of the Generalitat has admitted that in the face of a fire of these measures and behaviors, the current resources are insufficient. The climate emergencyis not only encouraging the occurrence of these fires at , but is completely transforming how they occur and how they should be dealt with.
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