Tropical Cyclone Case Study: Typhoon Haiyan 2013

Typhoon Haiyan (known locally as Yolanda) struck the Philippines on 8 November 2013 and remains one of the most powerful tropical cyclones ever recorded at landfall. This case study is essential for the Edexcel B specification as an example of a tropical cyclone affecting a lower-income country (LIC) or newly emerging economy (NEE). Haiyan demonstrates how vulnerability, poverty and geography can combine to produce catastrophic impacts even when warning systems are in place.

---

Background: The Philippines

The Philippines is an archipelago (group of islands) in the western Pacific Ocean, consisting of over 7,000 islands. It lies directly in the path of tropical cyclones forming in the world's most active basin — the western North Pacific. On average, the Philippines is struck by 20 tropical cyclones per year, of which approximately 8–9 make landfall.

Key Facts About the Philippines (2013)
Population	~98 million
GDP per capita	~$2,800 (lower-middle income)
Main livelihoods	Agriculture, fishing, services
Poverty rate	~25% of population below poverty line
Geography	Low-lying coastal areas, mountainous interiors, dense coastal populations
Warning system	PAGASA (Philippine weather service) issues warnings, but communication in remote areas is limited

---

Formation and Track

Typhoon Haiyan formed over the western Pacific Ocean on 2 November 2013, beginning as a tropical disturbance near Micronesia. It rapidly intensified over the warm waters of the Pacific, where sea surface temperatures exceeded 29°C — well above the 27°C threshold required for cyclone formation.

Key meteorological data:

Characteristic	Data
Peak sustained winds	315 km/h (195 mph) — the highest ever recorded at landfall at the time
Saffir-Simpson equivalent	Category 5 (the maximum rating)
Central pressure	895 hPa (one of the lowest ever recorded)
Storm diameter	~600 km
Landfall	Guiuan, Eastern Samar, 8 November 2013
Storm surge	Up to 7.5 metres in Tacloban, Leyte

Exam Tip: Haiyan's peak sustained winds of 315 km/h at landfall were the highest reliably recorded for any tropical cyclone making landfall at the time. This statistic makes it an excellent example for demonstrating the extreme power of tropical cyclones.

---

Primary Effects

The primary effects of Typhoon Haiyan were devastating:

Wind Damage

• Winds of up to 315 km/h flattened entire communities. In the city of Tacloban (population ~220,000), approximately 90% of buildings were damaged or destroyed.
• Concrete buildings lost roofs and walls; wooden and corrugated iron housing was completely demolished.
• Power lines and telecommunications infrastructure were destroyed across the affected region.
• Coconut plantations — a major source of income — were devastated, with an estimated 33 million coconut trees destroyed.

Storm Surge

• The storm surge was the deadliest aspect of Haiyan. In Tacloban, a surge of up to 7.5 metres swept through the city.
• Many residents were unfamiliar with the term "storm surge" — warnings used this English technical term rather than describing it as a giant wall of seawater. Many did not understand the danger and failed to move to higher ground.
• The surge carried ships, vehicles and debris inland, crushing buildings and drowning thousands.
• Entire coastal communities on the island of Leyte were swept away within minutes.

Rainfall and Flooding

• Haiyan produced heavy rainfall of up to 400 mm in some areas over 24 hours.
• Combined with the storm surge, this caused widespread flooding in low-lying areas.

---

Secondary Effects

Secondary Effect	Details
Death toll	Official count: 6,300 dead, over 1,000 missing. The true toll may be higher. The vast majority died from drowning in the storm surge
Displacement	Over 4 million people displaced; 600,000 left homeless. Many lived in emergency shelters or with relatives for months
Injuries	Over 28,000 people injured
Infrastructure damage	Tacloban airport was severely damaged; roads blocked by debris; bridges destroyed; ports damaged
Livelihoods destroyed	5.9 million workers lost their sources of income. Fishing boats destroyed, agricultural land ruined by saltwater
Economic cost	Estimated at $2.9 billion (approximately 5% of the region's GDP)
Water and sanitation	Clean water supplies contaminated by storm surge and flooding; sewage systems destroyed
Disease risk	Outbreaks of gastroenteritis, leptospirosis and respiratory infections in overcrowded evacuation centres
Looting and civil unrest	Desperate survivors looted shops and warehouses for food and water in the days following the disaster
Psychological trauma	Widespread PTSD, anxiety and depression among survivors, particularly children

Exam Tip: When writing about Haiyan's effects, always distinguish between primary effects (caused directly by the storm) and secondary effects (caused as a consequence of the primary effects). Use specific statistics to support your points — examiners reward precise data.

---

Short-Term Responses (Emergency Phase)

The immediate response to Haiyan involved both domestic and international efforts:

Response	Details
Philippine government	Declared a State of National Calamity; deployed the military to assist with search and rescue; established evacuation centres
Pre-storm warnings	PAGASA issued warnings 48 hours before landfall; over 800,000 people were evacuated before the storm hit. However, many returned home too early or sheltered in inadequate buildings
International aid	The UN launched a $301 million emergency appeal. Over 50 countries donated aid. The UK contributed £75 million
Military assistance	The US aircraft carrier USS George Washington deployed to provide helicopter rescue, medical aid and freshwater. The UK sent HMS Daring and HMS Illustrious
NGO response	Organisations including the Red Cross, Médecins Sans Frontières, Oxfam and Save the Children provided emergency shelter, food, water and medical care
Challenges	Blocked roads and damaged airports delayed aid delivery to remote areas. Tacloban airport was unusable for several days. Some communities were not reached for over a week

---

Long-Term Responses (Recovery and Reconstruction)

Response	Details
Rebuilding	The government established the Office of the Presidential Assistant for Rehabilitation and Recovery (OPARR) to coordinate long-term reconstruction
Build Back Better	New buildings were required to meet improved standards, with typhoon-resistant designs including reinforced concrete and elevated structures
Relocation	Thousands of families were relocated from coastal danger zones to new housing developments further inland. However, many resisted relocation because their livelihoods depended on the sea
Livelihood recovery	Programmes to replant coconut trees, replace fishing boats and provide microfinance to small businesses. Full recovery of coconut production was estimated to take 10–15 years
Improved warnings	PAGASA improved its warning system, including using local language terms instead of "storm surge" and expanding SMS-based warning alerts
Infrastructure	Tacloban airport was rebuilt; roads and bridges repaired; new evacuation routes established
Ongoing challenges	By 2016 (three years after Haiyan), an estimated 30,000 families were still living in temporary shelters. Recovery was slow due to limited government resources and corruption concerns

---

Why Was the Impact So Severe?

Several factors combined to make Haiyan's impacts catastrophic: