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MEASURING THE WEATHER (STEVENSON SCREEN (Placed high above the ground…

- - - - Occurs when moist air is lifted or forced to rise over a mountain range
      - Rainfall occurs on the windward side of the mountain range
      - The leeward side remains drier as it is in the rain shadow
      - Typically happens in Kwa-Zulu Natal
      - DIAGRAM
    - - The denser cold air mass pushes under the warm air mass forcing the warm air to rise
      - As the warm air mass rises it cools enough to condense and form cyclonic rainfall
      - Occurs when a warm air mass meets a cold air mass
      - Typically occurs in the south-western cape
      - DIAGRAM
    - - As the warm air rises it picks up moderate, cools and condenses to form convectional rainful
      - Typically occurs in the interior of SA
      - DIAGRAM
      - Occurs when the sun heats the earth intensely forcing the warm air to rise because of the excess heat the warm air rises rapidly