"' Fractonimbus "'are a form of stratus fractus, developing under precipitation clouds due to turbulent air movement.
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Stratus fractus can also form beside mountain slopes, without the presence of nimbus clouds ( clouds that precipitate ), and their color can be from dark grey to almost white.
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Stratus nebulosus may produce light drizzle, or flakes of snow . "'Stratus fractus "'clouds on the other hand, appear with an irregular shape, and forms with a clearly fragmented or ragged appearance.
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The species " Cumulus fractus " is ragged in appearance and can form in clear air as a precursor to cumulus humilis and larger cumulus species-types; or it can form in precipitation as the supplementary feature " pannus " ( also called scud ) which can also include stratus fractus of bad weather . " Cumulus humilis " clouds look like puffy, flattened shapes . " Cumulus mediocris " clouds look similar, except that they have some vertical development . " Cumulus congestus " clouds have a cauliflower-like structure and tower high into the atmosphere, hence their alternate name " towering cumulus ".
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