Weather

Weather

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Wind is caused by air moving from areas of high pressure to areas of low pressure. Its direction is influenced by the rotation of the Earth

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If the air weighs less than 1013 millibars, it is lighter. Light air is less dense- it is expanding. Air expands (becomes lighter) when it is heated. As warm air rises, it will condense and form clouds.it rises in a clockwise direction. This is called a low pressure system.

Low pressure system

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HIGH PRESSURE SYSTEM

weather  Air that weighs more than 1013 millibars is heavier/denser. Air becomes denser as it is cooled. This air sinks in an anti clock wise direction. This is called a High pressure system

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During the day the air above the land heats up, expands, and rises. The atmospheric pressure above the land drops and air moves in from above the sea, where the air pressure is higher. This causes a seas breeze or an onshore breeze.

ATMOSPHERE PRESSURE

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During the evening, the temperature of the land drops much faster than the temperature of the seaThe air above the sea becomes hotter than air above the land, so it rises and a breeze flows from the coast out to sea, reversing the effect