Depressions And Anticyclones


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Depressions And Anticyclones

  1. 1. Depressions and Anticyclones – A Revision Sheet DEPRESSIONS ANTICYCLONES Source: From: Pressure Low Pressure, Isobars (lines joining areas of High Pressure, isobars far apart equal pressure) close together Cold and Warm air masses meet and don’t mix Cool, dry air sinks creating an area of high Cause easily. The cold air pushes the warm air upwards pressure, and stable weather conditions for a creating an area of unstable weather. longer period of time (days-weeks). Anticlockwise direction. High wind speeds– the Wind closer together the isobars are, the higher the Clockwise, light or no wind wind speed. Strong winds, occasionally gale force, rainfall and cloud, thunderstorms can occur over cold Settled weather lasting for a number of days, front. clear skies, no rainfall due to little chance for air/water vapour to evaporate: Summer – clear skies, warm temperatures, heat Weather wave possible. Winter – clear skies, very cold due to no cloud cover and sun is lower in the sky in winter, no rainfall/no snow, but... frosts and fog due to air warming at surface as it sinks. Source: depression.gif Rainfall – can cause flooding i.e. damage to Summer – dehydration (particularly elderly and homes, possessions lost, businesses, transport children) due to not drinking enough water, heat routes cut off. stroke, sunburn, increased sales of ice-cream High winds – structural damage to buildings e.g. Effects on people etc, water shortages if no rainfall over longer chimneys blown off roofs, transport affected by period of time and possibly even droughts, fallen trees, bridges such as Severn Bridge hosepipe bans. closed affecting transport, lorries can be blown Winter – football and other sports games called over in very high winds. off due to frost, elderly people and children Snow in winter – schools closed, elderly people slipping on ice = broken bones, more traffic trapped in homes, transport: roads closed due to accidents due to icy roads, hypothermia in snow, trains cancelled, economic losses to elderly people. businesses due to people not going into work.