Tropical-cyclone formation and impacts
Identify where tropical cyclones form under syllabus conditions and explain how their impacts can affect people, infrastructure and ecosystems.
This original StudyForA sequence supports Cambridge IGCSE Environmental Management 0680 Topics 1–4 for exams in 2027, 2028 and 2029. Named local examples are chosen by the learner and centre; verify current conditions and local context with reliable sources. It is not a Cambridge paper, official grade or complete course.
Before you begin
- Use the 2027–2029 syllabus and check your exam year and centre's entry arrangements. Topics 1–4 are taught on this page; Topics 5–7 are still being built.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
At 4° north, does a location meet the stated latitude range?
What you will learn
- Identify where tropical cyclones form under syllabus conditions and explain how their impacts can affect people, infrastructure and ecosystems.
- Use evidence from an unfamiliar case to explain a cause-and-effect link and justify a suitable response.
Recognise formation conditions
Tropical cyclones are also called storms, hurricanes or typhoons. The syllabus states they form between 5° and 30° latitude north or south of the Equator, over ocean water at least 27°C and at least 60 m deep.
Check all the stated conditions when interpreting a map or scenario. A warm ocean alone does not prove that a cyclone will form; the listed location and depth conditions also matter.
Explain impacts on people and environments
Tropical cyclones can damage buildings and infrastructure and cause loss of crops, livestock and habitats. People and livestock may be evacuated; flooding and landslides can follow intense conditions.
Water supplies can be contaminated, water-related disease can increase, and events can cause financial losses and harm human health. Severity depends on exposure, warning, buildings, landforms and preparedness.
Use context and evidence
Separate the hazard from its impacts: wind and heavy rain are not the same as damage to a home, crop or service. Explain a pathway from the event to the outcome.
Use maps, population and infrastructure information to identify who or what is exposed. Avoid treating every cyclone or community as equally affected.
Sources for this lesson
Pause and explain
Which is a possible tropical-cyclone impact?
Worked example
A tropical storm develops over ocean at 18°N, 28°C and 80 m deep. State how each value compares with the syllabus conditions and explain one possible impact pathway.
Show the worked solution
- 18°N is between 5° and 30° north of the Equator.
- 28°C is at least 27°C and 80 m is at least 60 m, so all three listed conditions are met.
- Heavy conditions can damage buildings or crops, cause flooding, contaminate water and affect health; the actual outcome depends on exposure and preparedness.
Answer The location, temperature and depth meet the stated thresholds. Possible impacts include damage, flooding or water contamination, depending on local exposure and response capacity.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
A coastal settlement is 12°S with 29°C ocean water 70 m deep. Check the syllabus formation conditions and explain one reason impacts might be severe.
Give me a hint
Compare the absolute latitude and both ocean thresholds.
Compare my reasoning
- 12°S is between 5° and 30° south of the Equator.
- 29°C is at least 27°C and 70 m is at least 60 m.
- Exposure of homes or services to flooding, weak infrastructure or limited warning access could increase impacts; local evidence is needed.
All listed formation thresholds are met. Risk can be greater where exposed people and infrastructure have limited protection or response capacity.
Look for these in your work
- Latitude compared correctly
- Both ocean values checked
- Exposure linked to consequence
A report lists crop loss, contaminated drinking water and a landslide after a cyclone. Explain how two of these impacts could affect people and identify data needed to estimate the scale.
Give me a hint
Trace each impact to food, health, shelter or income and use measurable evidence.
Compare my reasoning
- Crop loss can reduce food availability and income for farmers.
- Contaminated water can harm health and increase water-related disease; a landslide may damage homes or block access.
- Use crop and livelihood records, water-quality tests, disease reports and affected population or infrastructure counts to estimate scale.
The impacts can affect food, income, health and access. Local records and measurements are needed to estimate how many people are affected and for how long.
Look for these in your work
- Two impact pathways explained
- Data match the outcomes
- Scale not asserted without evidence
Two towns face the same cyclone warning, but one is low-lying and has exposed water infrastructure. Explain why the forecast alone cannot predict equal impacts and what information responders need.
Give me a hint
Compare physical exposure and vulnerability, then name decision-relevant information.
Compare my reasoning
- The low-lying town may face greater flood exposure; exposed water infrastructure may be more likely to be damaged or contaminated.
- Buildings, population location, evacuation routes, warning access and shelter capacity affect vulnerability.
- Responders need local hazard forecasts, flood maps, water-system details, population needs and safe evacuation options.
The same hazard does not imply equal impacts. Local exposure and response capacity determine what information and action are needed.
Look for these in your work
- Hazard and vulnerability separated
- Two local factors explained
- Response data specified
Common mistakes
- Using a latitude outside the stated range as if it met the syllabus condition
- Treating 26°C as at least 27°C
- Saying the cyclone guarantees the same damage everywhere
- Confusing a hazard with an impact
What can you explain now?
What is the minimum ocean temperature in the syllabus conditions?
Compare with the explanation
27°C
The correct answer is “27°C”. The alternatives “17°C” and “60°C” do not match the syllabus concept. Identify where tropical cyclones form under syllabus conditions and explain how their impacts can affect people, infrastructure and ecosystems.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
Check the cyclone latitude, temperature and depth thresholds, then explain impacts using local exposure evidence.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.