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Cumulus Congestus or Cumulonimbus Calvus?


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  • Location: Yorkshire Puddin' aka Kirkham, Lancashire, England, United Kingdom
  • Weather Preferences: cold winters, cold springs, cold summers and cold autumns
  • Location: Yorkshire Puddin' aka Kirkham, Lancashire, England, United Kingdom

At the bottom of the second paragraph this website mentions an unusual Cumulus cloud called "Icy Cumulus":-

http://www.comanchepilot.com/Tech_Articles...COMANCHES_ON_...

The thing that sounds unusual to me about that name "Icy Cumulus" is that clouds from the Cumulus family usual don't begin to produce ice crystals/snow crystals until they at least grow to become Cumulonimbus Calvus (Latin for "Bold Showery cumulus"). This rule also usually includes Cumulus Congestus (which is a Towering Cumulus cloud that is usually completely composed by liquid cloud particles).

So could this "Icy Cumulus" cloud be:-

-an unusually cold Cumulus Congestus (Towering Cumulus) that was composed almost entirely with ice crystals

-another name for Cumulonimbus Calvus or another Cumulonimbus cloud growth stage development such as Cumulonimbus Capillatus (Latin for "Hairy Showery Cumulus"), or Cumulonimbus Incus (Latin for "Anvil Showery Cumulus")

-a transitional cloud between Cumulus Congestus and Cumulonimbus Calvus

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