Tropical Cyclone Case Study: Hurricane Sandy 2012

Hurricane Sandy struck the eastern United States on 29 October 2012, causing enormous economic damage and demonstrating that even the world's wealthiest nation is vulnerable to tropical cyclone hazards. Sandy is the Edexcel B specification's key example of a tropical cyclone affecting a high-income country (HIC), providing a direct contrast with Typhoon Haiyan in the Philippines. Comparing these two events reveals how wealth, infrastructure and governance shape disaster outcomes.

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Background: The Eastern United States

The eastern seaboard of the United States is home to some of the most densely populated and economically valuable real estate on Earth. New York City alone has a population of over 8 million people (metro area 20+ million), and its infrastructure — including the subway system, financial district, airports and power grid — supports the world's largest economy.

Key Facts About the USA (2012)
Population	~314 million
GDP per capita	~$51,000 (high-income country)
Warning system	National Hurricane Center (NHC); NOAA; extensive Doppler radar network; mass media
Building standards	Enforced building codes; many structures engineered to withstand extreme weather
Emergency management	FEMA (Federal Emergency Management Agency); National Guard; well-resourced state and local emergency services
Insurance	Widespread property insurance, including federal flood insurance programme (NFIP)

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Formation and Track

Hurricane Sandy formed in the Caribbean Sea on 22 October 2012 from a tropical wave. It followed an unusual track:

1. Sandy intensified over the warm Caribbean waters, making landfall in Jamaica as a Category 1 hurricane on 24 October, then crossing Cuba as a Category 3 storm on 25 October, killing 11 people in Cuba and causing $2 billion in damage.
2. Sandy moved into the western Atlantic and began to weaken, briefly falling below hurricane strength.
3. In a highly unusual development, Sandy interacted with a mid-latitude weather system (a cold front) and underwent extratropical transition — it merged with the cold weather system and grew enormously in size while regaining hurricane-force winds.
4. Sandy made landfall near Brigantine, New Jersey, on 29 October 2012 with sustained winds of 130 km/h (80 mph) — a Category 1 equivalent at landfall. However, its wind field was enormous — tropical-storm-force winds extended over 1,800 km (1,100 miles), making it the largest Atlantic hurricane on record by diameter.

Characteristic	Data
Peak sustained winds	185 km/h (Category 3 — in the Caribbean)
Winds at US landfall	130 km/h (Category 1 equivalent)
Storm diameter	~1,800 km — largest Atlantic hurricane on record
Central pressure at landfall	946 hPa (third lowest for a storm north of Cape Hatteras)
Landfall location	Brigantine, New Jersey, 29 October 2012
Storm surge in New York	Up to 4.2 metres at Battery Park, Manhattan
Countries affected	Jamaica, Cuba, Haiti, the Bahamas, USA, Canada (8 countries total)

Exam Tip: Sandy was "only" a Category 1 at US landfall, yet it caused $65 billion in damage. This proves that storm category alone does not determine impact — Sandy's enormous size, its timing with high tide, and the concentration of valuable infrastructure in its path were all critical factors.

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Primary Effects

Storm Surge

• Sandy's storm surge was devastating because it coincided with a full-moon high tide, producing a record 4.2-metre surge at Battery Park, lower Manhattan.
• The surge flooded the New York City subway system — seven subway tunnels under the East River were inundated. This was the worst damage to the subway system in its 108-year history.
• Seawater surged through the streets of lower Manhattan, flooding the Financial District, destroying electrical infrastructure, and inundating thousands of basements.
• Along the New Jersey shore, the surge destroyed or severely damaged thousands of homes and wiped out boardwalks, including the famous Seaside Heights boardwalk.
• On Staten Island, the surge swept through low-lying communities, killing 23 people — the highest death toll in any single New York borough.

Wind Damage

• While Sandy's winds were relatively moderate by hurricane standards (130 km/h), the storm's enormous size meant these winds persisted for an unusually long period.
• Millions of trees were brought down across the north-eastern US, damaging buildings, blocking roads and severing power lines.
• In Breezy Point, Queens (New York), wind-driven fires destroyed over 100 homes in a single neighbourhood during the storm.

Rainfall and Flooding

• Sandy produced moderate to heavy rainfall across a vast area, with some locations receiving over 300 mm of rain.
• Inland flooding affected areas of New Jersey, New York, Pennsylvania and West Virginia.

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Secondary Effects