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Cumulonimbus, frae the Laitin cumulus ("heap") an nimbus ("rainstorm", "storm clood"), is a dense touerin vertical clood associatit wi thunnerstorms an atmospheric instability, formin frae watter vapor carried bi pouerfu upward air currents.

Cumulonimbus clood
Anvil shaped cumulus panorama edit crop.jpg
Cumulonimbus capillatus incus
AbbreviationCb
SeembolClouds CL 9.svg
GenusCumulonimbus (heap, storm/rain)
Altitude2,000–16,000 m
(6,500–60,000 ft)
ClessificationFaimily D (Vertically developed)
AppearanceVery taw an lairge cloods
Precipitation clood?Yes, eften intense, but mey be virga (virga—occasionally a streak o precipitation but evaporates afore it hits the grund)