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Clouds
 

Clouds

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Meteorology and clouds

Meteorology and clouds

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    Clouds Clouds Presentation Transcript

    • Clouds John Harris - Head of Geography - Radley College - UK [email_address] http://geography.radley.org.uk
    • Water is strange stuff!
      • Gas - water vapour (invisible)
      • Liquid - water droplets (visible)
      • Solid - ice crystals, hail, snow
      Water can occur in 3 states:
    • What are clouds?
      • Clouds are formed of tiny droplets of water or ice.
      • Clouds form when water vapour cools and condenses .
      • The temperature at which condensation occurs is called dew point .
      • Condensation also requires nucleii (small particles) such as dust.
    • What happens when air is cooled?
      • Relative humidity increases.
      • Dew point is reached (100% relative humidity).
      • Water vapour (invisible) condenses to form water droplets (visible).
      • Sometimes the water vapour may change straight into solid state: called sublimation .
    • How is air cooled?
      • Contact eg with a cold surface such as over land in winter.
      • Convection eg uplift over warm ground.
      • Orographic eg rising over mountains.
      • Frontal eg when a mass of warm air meets and rises over a mass of cold air.
    • Cloud shapes Clouds can be classified by their shape and height Flat clouds eg Stratus (St) Fluffy clouds eg Cumulus (Cu) Wispy clouds eg Cirrus (Ci)
    • Cloud heights Clouds can also be classified by height of cloudbase Low level (below 2000m) eg stratus Middle level - alto (2,000 to 6, 000m) eg alto-cumulus High level - cirro (above 6,000m) eg cirrus
    • Spot the cloud!
      • Low and flat …..
      Stratus
    • Spot the cloud!
      • Middle level,
      • fluffy …..
      Alto -Cumulus
    • Spot the cloud!
      • High level,
      • wispy …..
      Cirrus
    • Spot the cloud!
      • Rain bearing,
      • storm clouds …..
      Cumulo-Nimbus
    • World cloud patterns Can you explain the major world cloud belts?