weather Archives - Free ZIMSEC & Cambridge Revision Notes

Pressure systems

By garikaib|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 […]

Comments Off

Introduction to weather and climate

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

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 […]

Comments Off

Temperature

By garikaib|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 […]

Comments Off

Stevenson’s screen

By garikaib|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. 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 […]

Comments Off

Humidity

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

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 […]

Comments Off

Wind direction and speed

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

A cup anemometer and windvane. Image by Noaa.gov. ZIMSEC O Level Geography Notes: Wind direction and speed.

Wind is the movement of air across the earth’s surface due to differences in pressure between two regions. Air moves from high pressure regions to low […]

Comments Off

Sunshine

By garikaib|2022-09-15T12:44:55+02:00January 24th, 2023|O Level Geography, Weather and Climate|

A sunshine recorder. Image by Rfuess-Mueller. ZIMSEC O Level Geography Notes: Sunshine

It has a glass sphere surrounded by a metal frame.
On the frame is attached a sensitive card.
The sphere focuses the sun’s rays onto the card.
As the sun moves across the sky it burns […]

Comments Off

Orographic/Relief Rainfall

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

Aberfoyle Tea Estate in the Eastern Highlands is one of the places that receive a lot of Relief rainfall. Image Credit Buckinghambirding. Aberfoyle Tea Estate in the Honde Valley Eastern Highlands is one of the places that receive a lot of Relief rainfall. Image Credit Buckinghambirding. ZIMSEC O Level Geography Notes: […]

Comments Off

Convectional rainfall

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

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 […]

Comments Off

Prevailing Winds in Southern Africa

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

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 […]

Comments Off

January 2023