Weather Hazards

  • Created by: liv.moz
  • Created on: 08-05-22 15:52
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  • Weather hazards
    • Global atmospheric circulation
      • Helps to determine patterns of weather and climate.
      • Large-scale movement of air by which heat and moisture is distributed around the surface of the earth.
      • Wind= the movement of air from areas of high to low pressure.
        • The wind moves from high pressure to low pressure because air pressure always tries to balance itself.
      • 1.Air is heated up by the Earth's surface and rises upwards.
        • 2. When reaches top of atmosphere, it moves outwards and begins to cool.
          • 3. When it is cool enough the air sinks back to the surface.
            • 4. When reaches the surface, the air moves outwards along the surface and begins to warm up
    • Coriolis effect
      • Winds move to the right of the Northern hemisphere and move to the left in the southern hemisphere.
      • The spinning of the earth creates the coriolis effect.
      • Its what gets a tropical storm spinning.
    • Tropical storms
      • an area of low pressure with winds moving in a spiral around a calm central point called the eye of the storm- winds are powerful and rainfall is heavy.
      • They happen in the tropics just North and South of the equator, where coriolis effect is srtong enough to make the storm spin.
      • 1.They form in the summer and autumn. The temperature of the water has to be atleast 27 degrees.
        • 2.The warm air rises quickly causing an area of low pressure.
          • 3.As air continues to rise quickly, it draws more warm moist air up from above the ocean leading to strong winds
            • 4.Rapidly rising warm air spirals upwards, cools, condences and large clouds form.
              • 5.Clouds produce eye wall of the storm and produce heavy rainfall.
                • 6.In centre of storm cold air sinks forming the eye of the storm.
      • A huge whirlpool- gigantic mass of revolving moist air.
      • Primary effects: destructive winds, debri, storm surges.
        • Secondary effects: flooding, fires.
      • Immediate responses: warnings, evacuations, emergency aid supplies, food and water.
        • Long-term responses: rebuilding infrastructure, storm surge warning systems.
    • Climate change
      • As global warming causes ocean temperatures to rise, it could mean that tropical storms will be able to form outside the current hazard zone.
      • UK
        • Types of extreme weather: storms, hurricanes, floods, extreme winds, extreme heat, snow, drought.


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