Cumulus clouds, being low-level clouds, are generally less than 2, 000 m ( 3, 300 ft ) in altitude unless they are the more vertical cumulus congestus form.
22.
A precipitation shaft is mostly found underneath convective clouds, like cumulonimbus cloud or cumulus congestus cloud during a downpour storm, as these have well defined vertical drafts ( updrafts and downdrafts ).
23.
An " arcus " feature is a roll cloud with ragged edges attached to the lower front part of cumulus congestus or cumulonimbus that forms along the leading edge of a squall line or thunderstorm outflow.
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While there is a gradation with respect to thunderstorm severity, there is little quantitative difference between a significant shower generated by a cumulus congestus and a small thunderstorm with a few thunderclaps associated with a small cumulonimbus.
25.
They look like cumulus congestus, but can be easily confused : " towers " of cumulus congestus grow above separate clouds, whereas in the case of stratocumulus castellanus, there is always a more or less defined layer of clouds.
26.
They look like cumulus congestus, but can be easily confused : " towers " of cumulus congestus grow above separate clouds, whereas in the case of stratocumulus castellanus, there is always a more or less defined layer of clouds.
27.
Warm fronts associated with extratropical cyclones tend to generate mostly cirriform and stratiform clouds over a wide area unless the approaching warm airmass is unstable, in which case cumulus congestus or cumulonimbus clouds will usually be embedded in the main precipitating cloud layer.
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Salar de Uyuni is also a climatological transitional zone since the towering tropical cumulus congestus and cumulonimbus incus clouds that form in the eastern part of the salt flat during the summer cannot permeate beyond its drier western edges, near the Chilean border and the Atacama Desert.
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With highly unstable atmospheric conditions, large cumulus may continue to grow into cumulonimbus " calvus " ( essentially a very tall congestus cloud that produces thunder ), then ultimately into the species " capillatus " when supercooled water droplets at the top of the cloud turn into ice crystals giving it a cirriform appearance.
30.
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 ".
