What are the causes and impacts of an extreme weather event, and how do people respond?
The causes, impacts and responses to an extreme weather event such as a tropical storm or a severe depression (AO1, AO2).
A focused CCEA GCSE Geography guide to extreme weather. Covers what makes weather extreme, how a tropical storm forms, the social, economic and environmental impacts of a major event, and how warning and management reduce the damage.
Reviewed by: AI editorial process; not yet individually human-reviewed
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What this dot point is asking
CCEA wants you to study an extreme weather event in depth: what causes it, the impacts it has on people and the environment, and how those impacts can be reduced. The classic example is a tropical storm (called a hurricane in the Atlantic), but a severe depression bringing storms and flooding to the British Isles also fits. You need a named example with real figures, and you must organise impacts into social, economic and environmental and responses into prediction, protection and planning.
What makes weather extreme
How a tropical storm forms
A tropical storm needs specific conditions, which is why it forms only in certain places and seasons.
- It forms over warm ocean water, above about 27 degrees Celsius, between roughly 5 and 30 degrees north or south of the Equator.
- Warm, moist air rises rapidly, cools and condenses, releasing latent heat that powers the storm.
- More air is drawn in at the surface and the system begins to spin (because of the Earth's rotation), forming a circular storm with a calm eye at the centre.
- The storm brings violent winds, torrential rain and a storm surge, a rise in sea level that floods the coast.
A tropical storm weakens once it moves over land or cooler water, because it is cut off from its warm-ocean energy source.
The impacts of an extreme weather event
Always organise impacts under three headings; the structure itself earns marks.
- Social impacts (on people): deaths and injuries, people made homeless, disrupted water and power, spread of disease, and damaged schools and hospitals.
- Economic impacts (on money and jobs): destroyed homes, businesses and crops, lost income and jobs, huge rebuilding costs, and damaged transport and ports.
- Environmental impacts (on the natural world): flooding, coastal erosion, polluted water, destroyed habitats and farmland buried by debris or salt water.
Reducing the impacts: the three Ps
Worked example: structuring an impacts answer
Common mistakes
Examples in context
Example 1. Why the storm surge does the most harm. When a tropical storm makes landfall, its low pressure and powerful winds push a dome of seawater ashore. In low-lying coastal cities this surge can flood streets metres deep within minutes, drowning people and ruining homes faster than the wind alone. Understanding the surge explains why coastal defences and evacuation of low ground are central to reducing deaths, a link CCEA rewards.
Example 2. Contrasting impacts in richer and poorer countries. The same strength of storm often kills far more people in a poorer country, where warning systems, sturdy buildings and emergency services are weaker, while a richer country may suffer larger financial losses because there is more expensive property to damage. Comparing impacts this way shows the examiner you understand that vulnerability, not just the storm, shapes the outcome.
Try this
Q1. State the minimum sea-surface temperature needed for a tropical storm to form. [1 mark]
- Cue. About 27 degrees Celsius.
Q2. Give one social and one environmental impact of an extreme weather event. [2 marks]
- Cue. Social: deaths, injury or homelessness. Environmental: flooding, erosion or destroyed habitats.
Q3. Name the three Ps used to reduce the impact of extreme weather. [3 marks]
- Cue. Prediction, protection and planning.
Exam-style practice questions
Practice questions written in the style of CCEA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
CCEA Unit 1 (style)6 marksFor a named extreme weather event, describe its social and economic impacts.Show worked answer →
Six marks, three for social impacts and three for economic, using a named event.
Name the event, for example a major tropical storm such as Hurricane Katrina (USA, 2005).
Social impacts: people were killed or injured, around 1,800 died; tens of thousands were made homeless when the levees failed and New Orleans flooded; and water supplies and hospitals were disrupted, threatening health.
Economic impacts: damage ran to over 100 billion US dollars; businesses, the port and oil industry were shut down; and the cost of rebuilding homes and flood defences was enormous.
Markers reward a named event with specific figures, clearly separated into social effects on people and economic effects on money and jobs.
CCEA Unit 1 (style)6 marksExplain how the impacts of an extreme weather event can be reduced.Show worked answer →
Six marks for explaining how preparation and response reduce impacts.
Prediction and warning: satellites track storms so forecasters can issue warnings and order evacuation, saving lives before the event arrives.
Protection: building flood defences, stronger buildings and storm shelters reduces damage, and burying power lines keeps services running.
Planning and response: emergency services, evacuation plans and aid (food, water, temporary shelter) reduce suffering after the event, and rebuilding can be made more resilient.
Markers reward the three Ps of prediction, protection and planning, each linked to how it actually cuts the loss of life or damage.
Related dot points
- The elements of weather, the instruments used to measure them, and how weather data is recorded and displayed (AO1, AO3).
A focused CCEA GCSE Geography guide to measuring the weather. Covers the seven elements of weather, the instrument used for each, the role of a Stevenson screen, and how to read and present weather data including synoptic charts and climate graphs.
- The air masses affecting the British Isles and the sequence of weather brought by a frontal depression (AO1, AO2).
A focused CCEA GCSE Geography guide to air masses and frontal depressions. Covers the main air masses affecting the British Isles, how a depression forms at the polar front, and the sequence of weather as the warm and cold fronts pass over.
- The characteristics of anticyclones and the contrasting summer and winter weather they bring to the British Isles (AO1, AO2).
A focused CCEA GCSE Geography guide to anticyclones. Covers what an anticyclone is, why high pressure brings settled weather, and how the weather it produces differs sharply between summer and winter in the British Isles.
- The natural and human causes of climate change, its global and local effects, and the strategies used to manage it (AO1, AO2).
A focused CCEA GCSE Geography guide to climate change. Covers the natural and human causes, the enhanced greenhouse effect, the global and local effects on people and the environment, and the mitigation and adaptation strategies used to respond.
- The causes of earthquakes, how they are measured, their effects, and the strategies used to prepare for and respond to them (AO1, AO2).
A focused CCEA GCSE Geography guide to earthquakes. Covers how earthquakes are caused at plate margins, the focus and epicentre, how they are measured, their social, economic and environmental effects, and the prediction, protection and planning used to manage them.
Sources & how we know this
- CCEA GCSE Geography specification — CCEA (2017)
- CCEA GCSE Geography (2017) Unit 1 past papers and mark schemes — CCEA (2024)