Pyrocumulonimbus
A pyrocumulonimbus is a fire-generated thunderstorm created by intense heat from wildfires or volcanic eruptions, characterized by erratic winds, dry lightning, and extreme fire behavior.
Via: French firefighters face 'pyrocumulonimbus' for first time - https://www.france24.com/en/live-news/20260726-french-firefighters-face-pyrocumulonimbus-for-first-time - Paris (France) (AFP) – The gigantic wildfire ravaging southwest France has created an extremely dangerous "pyrocumulonimbus" — a phenomenon never before seen in the country — the spokesman for the country's National Firefighters Federation of France (FNSPF) told AFP.