Characteristics of a high pressure system.
- Large area of slow moving air.
- High pressure as air is sinking.
- Temperature inversion is caused as the warming air sinks.
- The air sinks so coloud cannot form clouds, therefore clear skies.
- Light winds blow outwards, usually clockwise in the Northern hemipshere.
- High pressure usually end with thunderstorms, when uplift overcomes temperature inversion.
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- damage to ecosystems through drought, fires, heat and frost.
- trees loose their leaves as a result of drought.
- frost kills seedlings and buds so they are unable to reproduce.
- trees wilt in the heat with the need for more water.
- heat bakes the ground in a drought, so when it rains, flash floods occur.
- rivers and lakes dry up.
- sunsidence occurs: soils dry up and shrink.
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- health is poor due to heat, cold, fog and/or high pollen count.
- heat stroke occurs.
- Heat and cold damaging to buildings and houses.
- frost and fog can causes accidents and poor driving conditions.
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- frost and hot dry weather can kills off crops for farming.
- fires and droughts occuring in forestry areas.
- transport links can have issues with poor driving conditions and heat melting rails and roads.
- water shortages an cause problems for industry practices and power.
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- Frost. occurs in anticylconic winters, ploar continental.
- Fog. occurs especially in the autumn, polar air masses in the summer over the warm land.
- Droughts. tropical continental.
- Heatwaves. Tropical air masses.
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