Pyrocumulus clouds can dramatically alter the spread and intensity of wildfires

France fought an "unpredictable" wildfire close to Bordeaux on Sunday and Spain warned of "difficult hours" ahead in its own fiery battle, with more than 325,000 people evacuated…

Severe wildfires can generate their own unique weather systems. One of the most striking examples of this are dangerous pyrocumulonimbus, or pyroCB, clouds