Editing Cumulus cloud (section)

=== Cumulonimbus clouds ===
{{main article|Cumulonimbus cloud}}
Cumulonimbus clouds are the final form of growing cumulus clouds. They form when ''cumulus congestus'' clouds develop a strong [[updraft]] that propels their tops higher and higher into the atmosphere until they reach the [[tropopause]] at {{convert|18000|m|ft}} in altitude. Cumulonimbus clouds, commonly called thunderheads, can produce high winds, torrential rain, lightning, gust fronts, [[waterspout]]s, [[funnel cloud]]s, and tornadoes. They commonly have [[anvil cloud]]s.<ref name="TWC" /><ref name="cumulonimbus-incus" /><ref name="Ludlum471">{{harvnb|Ludlum|2000|p=471}}</ref>