Safety / Survival / Army Field Manuals / AFM 3-05.70
Appendix H
Clouds: Foretellers of Weather
Cumulonimbus clouds
Cumulonimbus clouds
Cumulonimbus is the cloud formation resulting from a cumulus cloud building up, extending to great heights, and forming in the shape of an anvil. You can expect a thunderstorm if this cloud is moving in your direction.
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