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Blustery
A description of a wind that changes speed unpredictably, but which is always moderate or strong.
Bora
A cold wind that blows from the north or northeast plains across the lands around the Adriatic Sea. It is most common in spring.
Breeze
A low-speed wind that can be classified as light, gentle, moderate, fresh, or strong (Beaufort scale
2 to 6).
Buster
A sudden, violent and cold wind that blows from the south across Australia (alternatively referred to in parts of Australia as a ‘southerly buster’ or a ‘brickfielder’). It occurs on the eastern side of the Great Dividing Range.
C
Calm
No apparent movement of the air (Beaufort scale 0).
Calms
A region close to the equator where there is no reliable prevailing wind and where the
air often moves very sluggishly. This, combined with the high humidity and temperature of the air, makes the region of calms very oppressive. (See also: Doldrums.)
Ceiling
A word used to describe the height of the base of the clouds on a cloudy day. The height is given
in metres.
Chinook
A foehn type of downslope wind in which moist wind from the Pacific Ocean first moves over the Rocky Mountains, where it loses much of its moisture, then sinks over the frozen plains of the northwestern United States and Canada, warming and drying further as it does so.
It often melts several centimetres of snow within a few hours. That is why the chinook is also called the ‘snow-eater’.
Circulation
The way in which air moves within the atmosphere. In general, air moves from regions of high pressure to regions of low pressure and from places where
it is hot to places where it is
cold. The spin of the Earth causes
the flow of air to take on curved or spiralling patterns, especially in the mid-latitudes.
Cirrocumulus cloud
High level, thin, white clouds made of ice crystals, often forming into regular ripples or bands across the sky. They are often the first clouds to be seen in advance of the arrival of a weather front.
Cirrostratus cloud
Thin layers of high, white clouds made of ice crystals. When seen through this very thin cloud, the Sun may appear to have a halo.
In fact, the halo may be the only thing to indicate the presence of
the cloud if it is extremely thin. Most cirrostratus clouds signal cold winter conditions and are often moving ahead of a weather front.
Cirrus cloud
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Cirrus cloud
Cirrus clouds are thin, veil-like, or wispy ice clouds that form high in the atmosphere. They are composed of ice crystals. They are normally a sign of fair weather.
 Cirrus cloud – Cirrus cloud has a typically wispy character. It is always seen against an otherwise clear blue sky.