January 2023

Cyclones

By |2022-09-15T12:44:51+02:00January 24th, 2023|O Level Geography, Weather and Climate|

The formation of a cyclone. Image via Imagarcade.

The formation of a cyclone. Image via Imagarcade. ZIMSEC O Level Geography Notes: Cyclones

Features of a cyclone.

  • These are systems of intense low pressure.
  • There are sometimes known as hurricanes (the U.S and the American continents) and typhoons( in Asian countries).
  • On a map the […]

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Drought

By |2022-09-15T12:44:37+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes, Weather and Climate|

Drought stressed maize. Image by Missouri.edu

Drought stressed maize. Image by Missouri.edu ZIMSEC O Level Geography Notes: Weather Hazards: Drought
  • In general terms drought is caused by a general shortage of precipitation over an extended period of time usually the rain season resulting in water shortages for both human and natural […]

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Rainfall

By |2022-09-15T12:44:50+02:00January 24th, 2023|O Level Geography, Weather and Climate|

Rainfall. Image via the Herald.

Rainfall. Image via the Herald. ZIMSEC O Level Geography Notes: Rainfall.
  • Rainfall is just one form of precipitation.
  • Precipitation occurs when warm moist air rises or is forced to rise.
  • Water vapor in the air parcel cools and condenses to form clouds.
  • This is because temperature falls with increase […]

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Frontal Systems

By |2022-09-15T12:44:59+02:00January 24th, 2023|O Level Geography, Weather and Climate|

Weather on a Front. Image by DiyMid.

Weather on a Front. Image by DiyMid. ZIMSEC O Level Geography Notes: Fronts

Fronts

-A front is a boundary between two air masses. Fronts are classified and named according to which air mass is replacing the other.

Warm Front


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Pressure systems

By |2022-09-15T12:44:54+02:00January 24th, 2023|O Level Geography, Weather and Climate|

The world's pressure belts

The world’s pressure belts and winds ZIMSEC O Level Geography Notes: Pressure

Pressure

  • Air has weight and therefore exerts pressure, called atmospheric pressure onto the earth’s surface.
  • The pressure is not the same for all regions nor is it the same for any one region all the time that […]

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Convectional rainfall

By |2022-09-15T12:44:49+02:00January 24th, 2023|O Level Geography, Weather and Climate|

Convectional Rainfall commonly occurs in rainforests. Image by Wallpaperlepi

Convectional Rainfall commonly occurs in rainforests. Image by Wallpaperlepi ZIMSEC O Level Geography Notes: Convectional Rainfall
  • This is the main type of rainfall in the humid tropics such as the Amazon and Congo rain forests.
  • Occurs when the ground surface is locally […]

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Introduction to weather and climate

By |2022-09-15T12:44:59+02:00January 24th, 2023|O Level Geography, Weather and Climate|

Rainy Weather. Image by Sodahead.

Rainy Weather. Image by Sodahead. ZIMSEC O Level Geography Notes: Introduction to Weather and Climate

Weather-the state of the atmosphere at a particular place and time as regards heat, cloudiness, dryness, sunshine, wind, rain, etc. The weather is all around us, all the time. It is an […]


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Convergence/Cyclonic/Frontal/Depression rainfall

By |2022-09-15T12:44:48+02:00January 24th, 2023|O Level Geography, Weather and Climate|

Zimbabwe receives most of its rainfall from the ITCZ. Image by Aljezeera.

Zimbabwe receives most of its rainfall from the ITCZ. Image by Aljezeera. ZIMSEC O Level Geography Notes: Frontal/ Cyclonic/Convergence Rainfall
  • This is also know as frontal or cyclonic or depression rainfall.
  • Cyclonic rainfall occurs in the temperate latitudes and is […]

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The Weather Station

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

A typical weather station. Image by Stanbachonline.

A typical weather station. Image by Stanbachonline. ZIMSEC O Level Geography Notes: Weather Station

-A weather station is a facility, either on land or sea, with instruments and equipment for measuring atmospheric conditions to provide information for weather forecasts and to study the weather […]


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