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3. Cloud Type Subclassifications
a. Nimbo-Nimbus. The prefix "nimbo-,' " or suffix "-nimbus," means rain cloud. Stratus
clouds from which rain is falling are nimbostratus (Ns), cumulus clouds from
whichrain is falling are cumulonimbus (Cb).
b. Fractus . Clouds that are broken into small pleces are often identified by the suffix
"-fractus;" for example, cumulofractus.
