Global Hazards- Weather Hazards

  • Created by: S_Bluck
  • Created on: 01-01-19 18:14

Weather Hazards


  • Caused by different air pressures
  • Large scale air movements 
  • Move from high pressure areas to low pressure areas
  • Trade Winds- blow from SE in the southern hemisphere and NE in northern hemisphere
  • Westerlies- blow from NW in southern hemisphere and blow from SW in northern hemisphere

Global Atmospheric Circulation

  • 3 Circulation Cells - Hadley, Ferrel, Polar
  • Low pressure belt - Rising air, Clouds, Minimal rainfall
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Weather Hazards

Global Climate Zones

  • Arid - High pressure belt caused by sinking air from 2 cells meeting at 30 degrees north and south of the equator (Low rainfall)
  • Tropical - Low pressure belts caused by rising air from 2 cells meeting near equator (High rainfall and high temperature)
  • Temperate - Low pressure belt caused by rising air from 2 cells meeting at 60 degrees north and south of equator (Frequent rainfall and moderate temperature)
  • Polar - Low temperature

Extreme Weather

  • Winds - Cape Town
  • Temperature- Sahara Desert
  • Rainfall- Amazon Rainfall
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Weather Hazards

Tropical Storms

  • Spin caused by earths rotation
  • Strength increases when storms move over warm water
  • Develop over warm water
  • Frequent distribution of tropical storms
  • Strength decreases when stroms move over land or cool water
  • Most happen in late summer and autumn
  • Most happen between 5 and 30 degrees north and south
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Weather Hazards


  • Anticyclones are capable of blocking depressions (weather systems that cause rain)
  • Frequency of droughts has remained fairly constant but distriution has changed alot.
  • Main causes - Changes in atmospheic circulation, blocked depressions
  • Distribution - Strong threat for central and southern Africa, Australia, Middle East, western South America and patches of North America.

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