Impacts of Tropical Storms

Tropical storms are intense weather systems characterized by strong winds and heavy rainfall. They can cause widespread damage and affect people, economies, and environments.

Types of Impacts

Tropical storms cause a range of impacts that can be divided into primary and secondary effects, affecting people, the economy, and the environment.

Primary Impacts

• Wind damage: Extremely strong winds (over 119 km/h) can destroy buildings, uproot trees, and damage power lines, leading to power outages.
• Flooding: Heavy rainfall during tropical storms causes rivers to overflow and flash floods, damaging homes, roads, and farmland.

Secondary Impacts

• Landslides: Saturated soil on hillsides can give way, causing landslides that destroy homes and block roads.
• Disease outbreaks: Floodwaters can contaminate drinking water supplies, leading to waterborne diseases such as cholera and typhoid.

Social, Economic and Environmental Effects

The impacts can be categorised into social (effects on people), economic (effects on money and jobs), and environmental (effects on nature and ecosystems).

Social Impacts

• Loss of life and injuries: Tropical storms can cause deaths and serious injuries due to collapsing buildings, flying debris, and drowning.
• Displacement and homelessness: Many people lose their homes and are forced to live in temporary shelters or camps.
• Health issues and stress: Poor sanitation and contaminated water increase disease risk. The trauma of losing homes and loved ones causes mental health problems such as anxiety and depression.

For example, during Hurricane Katrina in 2005, over 1,800 people died, and thousands were left homeless, highlighting the severe social impact of tropical storms.

Economic Impacts

• Damage to infrastructure and homes: Roads, bridges, schools, hospitals, and houses can be destroyed or severely damaged, disrupting daily life and services.
• Loss of income and jobs: Businesses may close temporarily or permanently, especially in farming, fishing, and tourism, leading to unemployment and loss of earnings.
• Cost of repairs and aid: Governments and charities spend large sums on rebuilding and emergency aid, which can strain national budgets, especially in poorer countries.

For instance, Typhoon Haiyan in the Philippines (2013) caused economic losses estimated at $\$5.8$ billion due to widespread destruction of homes, infrastructure, and crops.

Environmental Impacts

• Destruction of habitats: Strong winds and flooding can destroy forests, coral reefs, and wetlands, harming wildlife and reducing biodiversity.
• Soil erosion and contamination: Floodwaters wash away fertile topsoil and deposit salt or pollutants, reducing land quality for farming.
• Flooding effects on ecosystems: Freshwater ecosystems can be disrupted by saltwater intrusion, and aquatic life may be harmed by changes in water quality and flow.

For example, after Hurricane Maria in 2017, large areas of Puerto Rico’s forests were damaged, affecting many plant and animal species.

Learning Example: Calculating Economic Loss per Household

If a tropical storm causes $\text{£}1.2$ billion in damage and affects 300,000 households, the average economic loss per household is:

$$\frac{\text{£}1,200,000,000}{300,000} = \text{£}4,000$$

This means each household, on average, faces $\text{£}4,000$ worth of damage or loss.

For example, if 120 people are injured out of a population of 10,000, the percentage injured is $\frac{120}{10,000} \times 100 = 1.2\%$.