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STANDARD GRADE
ANTICYCLONES
John Smith Invergordon Academy
HIGH PRESSURE
SYSTEMS
High pressure systems are also known as anticyclones
HIGH ATMOSPHERIC PRESSURE
The Earth’s atmosphere
presses down on the surface of
the Earth.
Cold, dense air falls. This
increases the weight of the
air pressing down on the
Earth’s surface.
The Earth’s surface
WHAT CAUSES HIGH PRESSURE?
When air high in the atmosphere is cold, it falls
towards the earth’s surface.
Falling air increases the weight of air pressing down
on the Earth’s surface.
This means that air pressure is high.
WHAT WEATHER DOES HIGH PRESSURE BRING?
As the cold air falls through the atmosphere, it
becomes slightly warmer.
Because warm air can hold more moisture than cold
air, no condensation or clouds occur.
There are no warm or cold fronts in high pressure areas.
This means that high pressure systems bring clear skies.
Winds are usually light, and blow out of the high
pressure area.
HIGH PRESSURE IN WINTER
High pressure in winter gives us
clear skies
very low temperatures
calm, or light winds
no precipitation
frosty conditions
HIGH PRESSURE IN SUMMER
High pressure in summer
gives us
clear skies
high temperatures
calm, or light winds
no precipitation
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