this fire has grown to the point of creating its own weather forecast!

La violence du Bootleg Fire (Oregon, États-Unis) l’amène à générer des pyrocumulus. © nd700, Adobe Stock



Bootleg Fire. Nothing seems to stop him. Especially since here he’s starting to create his own weather forecast over Oregon. Dry storms that make it even more virulent.

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[EN VIDÉO] 20 years of fires around the world in 30 seconds
This is what a burning earth looks like. This is not a doomsday scenario, but a summary of the scale of fires that have occurred around the world in the last two decades. Twenty years of forest fires, watched from above by the Terra satellite, which NASA condensed into a 30-second animation.

It has already devastated an area larger than the area of ​​the city of Los Angeles. The one who was baptized Bootleg Fire burns Oregon (United States) from July 6th. Every hour it’s as if the whole of Central Park is going up in smoke. Unheard of at this stage season. And officials are now afraid that this is gigantic forest fire cannot be contained until … November!

The fire has even grown to the point that it is now creating its own time, scientists tell us. They watched the creation of what they call it pyrocumulus or pyrocumulonimbus. They are hard to miss. They are visible for almost 200 kilometers around.

Pyrocumulus clouds form when warmth intense flame a fire forest forceair to rise quickly, sucking out smoke, ash, but also water vapor. Pyrocumulonimbus clouds look like the clouds of a classic thunderstorm.

Good news on the battle front against this huge fire? Not really. Because unlike thunderstorms a classic, thunderstorm triggered by a pyroculum doesn’t rain much. It is the heat and the smoke particles that concentrate. Result: a dry storm which can create vortices of fire and create winds extremely violent.

Potentially destructive pyrocumulonimus clouds

Pyrocumulonimbus can also create lightning. Lightning from electrically charged ash particles. When these move very quickly towards the clouds and cause a potential difference that is triggered by lightning.

We better understand why creating such clouds worries us. Because the storms they trigger not only do not help calm the flames, but increase the chances of the forest fires spreading causing them. By combining strong winds and lightning strikes in ultra-dry vegetation. Researchers Our moreover pyrocumulonimbus qualifies as “Fire-breathing dragons”.

“Traditional weather tells us what will happen to the forest fire. This time it is the forest fire that dictates what we should expect from the weather. “, underlines an official in a CNN column. Already, more than 2,000 people had to be evacuated as the fire destroyed 67 houses. Unprecedented means have been used to fight the fire, but experts estimate that 20 to 40,000 hectares could still be smoked before it is stopped.

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