He added three combined terms : cirrocumulus, cirrostratus and cumulostratus.
2.
Cumulostratus described large cumulus clouds blended with stratiform layers in the lower or upper levels.
3.
Howard's cumulostratus was not included as a distinct type, having effectively been reclassified into its component cumuliform and stratiform genus types already included in the new canon.
4.
In addition to these three main types, Howard added two names to designate multiple cloud types joined together : " cumulostratus, " a blending of cumulus clouds and stratus layers, and " nimbus, " a complex blending of cirriform, cumuliform, and stratiform clouds with sufficient vertical development to produce significant precipitation.
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