High Pressure systems. Characteristics and hazard impacts. 3.0 / 5 based on 2 ratings ? GeographyWeather systemsA2/A-levelAll boards Created by: EllieCreated on: 31-05-12 19:11 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. 1 of 5 Environmental hazards. 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. 2 of 5 Social hazards. 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. 3 of 5 Economic hazards. 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. 4 of 5 Hazards resulting. 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. 5 of 5
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