Convectional rainfall
Convectional Rainfall commonly occurs in rainforests. Image by Wallpaperlepi ZIMSEC O Level Geography Notes: Convectional Rainfall
February 2025
Introduction to 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 […]
Convergence/Cyclonic/Frontal/Depression rainfall
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 […]
The Weather Station
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 […]
Prevailing Winds in Southern Africa
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 […]
Temperature
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 […]
The rain-shadow effect
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 […]
Stevenson’s screen
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 […]
Weather symbols/ Synoptic Charts
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 […]
Humidity
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 […]