Weather and Climate

May 2015

Drought

By |2017-01-17T11:22:33+02:00May 30th, 2015|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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Frost/Snow and Hail

By |2017-01-17T11:22:34+02:00May 30th, 2015|Notes, O Level Geography, Ordinary Level Notes, Weather and Climate|

A house and vehicle covered in snow. Image by Novinite.

A house and vehicle covered in snow. Image by Novinite. ZIMSEC O Level Geography Notes: Frost/Snow and Hail.

Snow/Frost

  • Caused by a sudden fall or drop in temperature.
  • With snow ice crystals are formed in the atmosphere.
  • When these small ice crystals collide with […]

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Floods

By |2017-01-17T11:22:35+02:00May 30th, 2015|Notes, O Level Geography, Ordinary Level Notes, Weather and Climate|

Floods in OZ. Image by Time.

Floods in OZ. Image by Time. ZIMSEC O Level Geography Notes: Weather Hazards: Floods.
  • Some parts of Zimbabwe especially low lying areas like Muzarabani. The Tokwe-Mukosi area near Masvingo experienced severe floods in the 2014/15 rain season leaving a lot of homes destroyed and people […]

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Lightining

By |2017-01-17T11:22:36+02:00May 30th, 2015|Notes, Weather and Climate|

Lightining. Image by GreenSociety.

Lightining. Image by GreenSociety. ZIMSEC O Level Geography Notes: Weather Hazards: Lightining
  • Is typically caused by the physical characteristics of cumulonimbus weather conditions.
  • As rain drops fall the energy which they have causes a positive charge to develop at the top of a cloud and negative charges to develop […]

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Weather Hazards

By |2017-01-17T11:22:36+02:00May 30th, 2015|Notes, O Level Geography, Ordinary Level Notes, Weather and Climate|

Floods are just one of many natural weather hazards. Image by The Australian.

Floods are just one of many natural weather hazards. Image by The Australian. ZIMSEC O Level Geography Notes: Weather Hazards
  • Weather hazards are conditions which are unfavorable to people and their activities that result from weather phenomena.
  • There are […]

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People and Weather

By |2017-01-17T11:22:38+02:00May 29th, 2015|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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Unintentional changes to weather

By |2018-05-10T15:34:27+02:00May 29th, 2015|Notes, O Level Geography, Ordinary Level Notes, Weather and Climate|

ZIMSEC O Level Geography Notes: People and Weather: Accidental Changes

Acid Rain

  • The smoke from burning fuels and chemical industries rises into the air and mixes with water vapour.
  • When the rain falls down it becomes acidic.
  • The acid rain is a weak acid made up of sulphuric and nitric acids.
  • Over, a long time (years for example), the rain […]

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Urban Heat Islands

By |2017-01-17T11:22:39+02:00May 29th, 2015|O Level Geography, Ordinary Level Notes, Weather and Climate|

Urban Heat Island. The diagram shows typical temperature differences between an Urban area and the adjacent rural area. Image via Pixshark.

Urban Heat Island. The diagram shows typical temperature differences between an Urban area and the adjacent rural area. Image via Pixshark.

  ZIMSEC O Level Geography Notes: Urban Heat Islands.

  • Due […]

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

By |2017-01-17T11:22:40+02:00May 29th, 2015|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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Weather symbols/ Synoptic Charts

By |2017-01-17T11:22:43+02:00May 25th, 2015|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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