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Cloud
A large number of water droplets or ice crystals suspended in the atmosphere. The water or ice partly blocks out the Sun, so that the cloud appears as a white to dark grey mass in the sky.
(For types of cloud see: Alto-; Altocumulus; Altostratus; Cirrocumulus; Cirrostratus; Cirrus; Cumulonimbus; Cumulus; Layer cloud; Nimbostratus; Nimbus; Stratocumulus; Stratus.)
Cloudburst
Used to describe very sudden, heavy rainfall such as would come from a summer thunderstorm.
Col
A region of the atmosphere between two high pressure or two low pressure areas. There is little wind, and the weather is often dull and slow to change.
Cold climate
Where there is a long cold season lasting between six and nine months.
Cold front
The boundary between warm and cold air near the rear of a depression. Ahead of the front, in the warm part of the depression, the air is warmer than anywhere else
in the depression. The air generally sinks, or at least does not rise, so shallow cloud is all that forms.
At a cold front, cold air undercuts warm air in a depression. The undercutting lifts the warm air and makes all the air cool. This may cause some of the air to shed its moisture as droplets of water. As it does this, heat is released
and the lower part of the cloud may warm enough to rise of its
own accord, forming large amounts of tall cumulus cloud called cumulonimbus. Heavy, squally rain then follows. Behind the cold front lies cold air that has come from the poles. This air warms
in its lower layers as it moves, and pockets of warmed air rise, causing cumulus clouds to form and showers to follow.
The weather behind a cold front is typically sunshine and showers with a cold or fresh wind.
(See also: Depression.)
Condensation
The process in which moisture
or vapour changes to liquid water when it comes into contact with cold surfaces, or when air is
lifted to cold, high parts of the atmosphere. A common form of condensation on the ground is dew. In the air condensation takes place on floating microscopic particles
of dust. They grow into water droplets, which are seen as cloud. Condensation releases some heat, which keeps the air from cooling very rapidly. (See also: Fog.)
 Condensation – Condensation is often seen most easily through the formation of dew on leaves and the production of radiation or steam fog.
Cold air sinks down hillsides and fills valley bottoms. Cold, moist air condenses to make fog.
Dew forms during a cool night.
Condensation
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