Australia's wildfires are now generating their own weather Digital Writers mardi, 31 décembre 2019 à 16:18 - The massive fires are generating pyrocumulonimbus clouds, which can start more wildfires on their own. Australia's enormous and widespread bushfires have now reached the point where they are generating their own weather, creating a feedback loop that will make the already dire situation worse. That's according to the Bureau of Meteorology office for the state of Victoria, which says it's observed pyrocumulonimbus clouds above eastern parts of the state. The mechanism by which these clouds form isn't completely understood, but to observers, the clouds will appear very similar to the kind of clouds known to produce thunderstorms.