The cumulonimbus #flammagenitusCloud (CbFg), also known as the pyro#cumulonimbusCloud, is a type of cumulonimbus cloud that forms above a source of heat, such as a #wildfire, nuclear explosion, or volcanic eruption, and may sometimes even extinguish the fire that formed it. It is the most extreme manifestation of a flammagenitus cloud. According to the #AmericanMeteorologicalSociety’s Glossary of Meteorology, a flammagenitus is "a #cumulus cloud formed by a rising thermal from a fire.
