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| Cumulus Clouds |
Darren Dowling
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Cumulus
Cumulus is the result of convection. The ground is heated
and masses of warm air, thermals rise. The thermals mix
with the surrounding air which is drier, and the cloud evaporates.
The rising parts have sharply outlined tops and are very
white. The evaporating parts are ragged and of a duller
colour.
Cumulonimbus
Cumulonimbus is the name given to cumulus from which rain
is falling. This picture shows a large example which is
partly glaciated at the top. At a much higher level a thin
layer of cirrus cloud (made of ice cyrstals) can be seen.
Cumulonimbus - Ice Anvil
Cumulonimbus produces an ice anvil if it spreads out at
a stable layer after becoming glaciated. The nearest tower
has pileus on it as it pushes up a short distance into the
stable layer before sinking back and spreading out as an
ice anvil.
Pileus
A pileus or cap cloud often appears on the top of a thermal.
This cumulus is being produced from thermals rising off
the east side of a hill which is the first place to be warmed
in the morning.
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