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Photos of the South Island of New Zealand – the quest being a landscape re-imagined and then re-imaged
A frontal passage is characterised not only by often dramatic visual changes, but also by changes in temperature, wind direction, wind intensity and a change in barometric pressure.
When cold air is advancing and replacing warmer air, the front is designated as a cold front; when warmer air is advancing, the front is designated as a warm front.
Other types of wild clouds can be thunder heads i.e. warm air rapidly rising to high altitudes will usually be very unstable and can bring on short lived and dramatic local weather events
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