Galloper Wind Farm Project - National Infrastructure Planning

2842_SLVIA
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patterns, light conditions and tidal movements as well as being influenced by
the relative clarity of the atmosphere.
5.4.2. Collectively, both the overall climate and the day-to-day weather patterns
will combine to reduce the number of days upon which views of the
proposed offshore wind farm will be available from the coastline and
hinterland. Moreover, even where poor visibility does not wholly obscure
views of the proposed offshore wind farm, it will still inhibit views of the
development, rendering it more visually recessive within the wider seascape
setting.
5.4.3. Generally, visibility is greatest during cyclonic (low pressure) weather, where
the 'cold air' reduces the concentration of particles in the atmosphere and
allows for clearer visibility. Reduced visibility occurs typically where an
anticyclone (high pressure) and an associated warm front become established
which can give rise to haze or fog.
5.4.4. Generally, the weather within the study area is influenced by three major
meteorological features:
� The Azores High - creating a ridge of high pressure over the southeast of
England during the summer months;
� The Asiatic Anticyclone - creating areas of high pressure affecting the
UK; and
� Atlantic Depressions - a series of low pressure weather systems affecting
the UK.
5.4.5. Typically, visibility looking out to sea from onshore locations within the
study area is less than 20km for 55% of the year (200 days). Visibility over
distances between 20-30km is available for 23% of the year (84 days).
Visibility over distances greater than 30km may be possible for 22% of the
year (80 days), when viewing conditions are at an optimum.
5.4.6. For the purposes of this assessment, the following descriptions have been
used to describe meteorological conditions in which views towards distant
elements may be possible:
� Moderate visibility - elements at a distance up to 20km may be visible;
� Good visibility - elements at a distance up to 30km may be visible;
� Very good visibility - elements at a distance up to 40km may be visible;
and
� Excellent visibility - elements at a distance greater than 40km may be
visible.