The towering formations appearing over severe wildfires in France and Oregon loft smoke so high they have global consequences.

Firefighters battling devastating fires in France have had to contend with a new threat: immense fire clouds that create their own wind and even lightning that can spark fresh…

French firefighters are grappling for the first time with immense fire clouds, known as pyrocumulonimbus clouds, created by extreme wildfires, as they struggle to bring a forest…