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Weather under high and low pressure
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Weather under high and low pressure

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  • 1. Air Pressure and Weather What different kinds of weather do high and low pressure create?
  • 2. Different kinds of Air Pressure What’s the difference between high and low pressure? Air that is sinking Air is pressing down onto the surface of the earth. Air that is rising Air is lifting off and moving away from the surface of the earth.
  • 3. Different kinds of Air Pressure What would happen to this air? Warm air Cold air Molecules far apart. Molecules close together. Molecules moving around a lot. Molecules not moving around much. Less dense. More dense.
  • 4. Weather under High pressure What kind of weather does high pressure create? As the air sinks it warms up and so there is less chance of condensation.
  • 5. Weather under High pressure What kind of weather does high pressure create?
  • 6. Weather under Low pressure What kind of weather does low pressure create? As the air cools, water in it condenses forming clouds. As it rises the air cools. Warm air rises.
  • 7. Weather under Low pressure What kind of weather does low pressure create?
  • 8. Weather under Low pressure What happens when warm and cold air meet? The warm air rises over the cold air and cools down. The cold air is more dense The warm air is less dense Cold air Cold air Warm air Warm air This is a front
  • 9. Weather under Low pressure What kind of weather does low pressure create? Warm air rises over colder/cool air because it less dense. As the warm air rises is cools. As the air cools, water in it condenses forming clouds.
  • 10. Weather under Low pressure What kind of weather does low pressure create? Cold air pushes under warm air because it is more dense. The less dense warm air is pushed upwards and as it rises it cools. As the air cools, water in it condenses forming clouds.
  • 11. Weather under Low pressure How does weather in a depression change? Cold Front Cold air forces the warm air up producing cloud and rain. Warm Sector The temperature rises, its cloudy with a few showers but no heavy rain. Warm Front Warm air rises over cold air, producing cloud and rain.