January 2023

Prevailing Winds in Southern Africa

By |2022-09-15T12:44:47+02:00January 24th, 2023|O Level Geography, Weather and Climate|

The Harmattan

The Harmattan. Image by  Kafkaesqublog ZIMSEC O Level Geography Notes: Prevailing Winds in Southern Africa
  • The eastern parts of Zimbabwe about 200km from the port of Beira and on average Zimbabwe is about 400km from the Indian Ocean, the closest ocean to the country.
  • Due to its proximity to the […]

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Temperature

By |2022-09-15T12:44:58+02:00January 24th, 2023|O Level Geography, Weather and Climate|

Six's thermometer

Six’s thermometer ZIMSEC O Level Geography Notes: Temperature
  • The daily maximum and minimum temperatures are measured using Six’s thermometer (pictured above).
  • It was invented by James Six a British scientist hence the name Six’s thermometer.
  • It is also known as the Maximum and Minimum thermometer.
  • It is housed in a Stevenson’s screen.
  • Diurnal […]

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The rain-shadow effect

By |2022-09-15T12:44:46+02:00January 24th, 2023|O Level Geography, Weather and Climate|

Sem-arid conditions in Save Valley are due to the Rain-shadow effect. Image by Youth Delegates

Sem-arid conditions in Save Valley are due to the Rain-shadow effect. Image by Youth Delegates ZIMSEC O Level Geography Notes: Rain Shadow Effect

We have already looked at the formation of relief rainfall elsewhere. The […]


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Stevenson’s screen

By |2022-09-15T12:44:58+02:00January 24th, 2023|O Level Geography, Weather and Climate|

An open Stevenson screen showing the instruments it houses. Image by Hubhomedesign.

An open Stevenson screen showing the instruments it houses. Image by Hubhomedesign. ZIMSEC O Level Geography Notes: Stevenson Screen

A Stevenson screen is a prominent feature on most weather stations.

  • It is used to house weather instruments, for example the […]

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Weather symbols/ Synoptic Charts

By |2022-09-15T12:44:45+02:00January 24th, 2023|O Level Geography, Weather and Climate|

weather-min

ZIMSEC O Level Geography Notes: Weather Symbols and Synoptic Charts

  • After weather measurements have been taken at weather stations
  • they are then plotted onto synoptic charts.
  • These charts make use of special symbols as a form of pre-agreed shorthand that is used to show the weather conditions at a given place at a […]

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Humidity

By |2022-09-15T12:44:57+02:00January 24th, 2023|O Level Geography, Weather and Climate|

Wet and dry bulb thermometer. Image by TradeIndia

Wet and dry bulb thermometer. Image by TradeIndia ZIMSEC O Level Geography Notes: Humidity

-a quantity representing the amount of water vapor in the atmosphere.

  • It is measured using a hydrometer.
  • The wet and dry bulb thermometer is also known as a psychrometer.
  • Weather satellites can […]

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People and Weather

By |2022-09-15T12:44:40+02:00January 24th, 2023|Notes, O Level Geography, Weather and Climate|

People and Weather. Image via CNN.

People and Weather. Image via CNN. ZIMSEC O Level Geography Notes: People and Weather
  • The earth’s climate and weather conditions have been changing constantly throughout the earth’s Geological Timescale.
  • This has in turn had an impact on people’s cultures, history and current economical and social […]

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Pressure

By |2022-09-15T12:44:57+02:00January 24th, 2023|O Level Geography, Weather and Climate|

An aneroid barometer. Image imgkid.

An aneroid barometer. Image imgkid. ZIMSEC O Level Geography Notes: Pressure.

-is the pressure exerted by the weight of air in the atmosphere of Earth. It is measured in millibars. It is measured using an instrument known as a barometer. There are two different types of […]


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Deliberate Changes to weather: Cloud seeding, Dam construction, Greenhouses

By |2022-09-15T12:44:42+02:00January 24th, 2023|O Level Geography, Weather and Climate|

Greenhouses are used to grow crops like tomatoes in areas that suffer from frost or during winter.

Greenhouses are used to grow crops like tomatoes in areas that suffer from frost or during winter. Image via Sustainablenantucket. ZIMSEC O Level Geography Notes: People and Weather: Deliberate Changes

Greenhouses

  • These are used […]

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Clouds

By |2022-09-15T12:44:56+02:00January 24th, 2023|O Level Geography, Weather and Climate|

Clouds. Image by ThirdScribe.

Clouds. Image by ThirdScribe. ZIMSEC O Level Geography Notes: Clouds

Refers to the fraction of the sky obscured by clouds when observed from a particular location. Okta is the usual unit of measurement of the cloud cover. Sky conditions are estimated in terms of how many eighths of the […]


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