Hurricane Andrew (1992): The Storm That Flattened South Florida

Hurricane Andrew was a compact but extremely powerful hurricane that struck the northern Bahamas, South Florida and Louisiana between 23 and 26 August 1992. Its landfall near Homestead, south of Miami, on 24 August destroyed or damaged well over 100,000 homes and made it the costliest natural disaster in US history up to that time. Andrew’s lessons transformed Florida’s building codes and its home insurance market.

Formation and track

Andrew began as a tropical wave off the coast of West Africa and became a tropical depression on 16 August 1992, the first storm of a slow Atlantic season. For several days strong upper-level winds kept it weak, and it nearly fell apart east of the Lesser Antilles.

Conditions then changed. From 21 August Andrew turned west under a strengthening high-pressure ridge and intensified rapidly over warm water. On 23 August it reached Category 5 strength, with a central pressure of about 922 millibars, and struck Eleuthera and the Berry Islands in the northern Bahamas that evening.

Landfall in South Florida

Andrew crossed Elliott Key and came ashore near Homestead, in southern Dade (now Miami-Dade) County, at about 5 a.m. local time on 24 August. A reanalysis published in 2002 estimated its sustained winds at about 165 mph (270 km/h), upgrading it from Category 4 to Category 5. That placed Andrew alongside the Labor Day hurricane of 1935 among the very few storms known to have struck the US mainland at the highest category. Gusts destroyed many of the instruments meant to measure them, including the radar on the roof of the National Hurricane Center in Coral Gables.

Because the storm was small and fast, the worst winds struck a band roughly 30 to 40 km wide. Within that band, communities such as Homestead, Florida City and Cutler Ridge were devastated. Mobile homes were almost completely destroyed, and many frame houses lost their roofs, after which walls and interiors failed. Homestead Air Force Base was wrecked. A storm surge of up to about 5 metres (16.9 feet) struck the shore of Biscayne Bay.

Andrew crossed the peninsula in about four hours, entered the Gulf of Mexico and turned north-west. It made a second landfall on the central Louisiana coast, west of Morgan City, on 26 August as a Category 3 hurricane, causing further damage, flooding and tornadoes before weakening over land.

Response and controversy

About a million people had been evacuated from coastal South Florida, which helped keep the death toll low. The aftermath was chaotic, however. Roads were blocked, telephones were down and hundreds of thousands of people had no power, water or shelter in the late-summer heat.

Three days after landfall Kate Hale, Dade County’s emergency management director, publicly asked “Where the hell is the cavalry on this one?”, criticising the slow federal and state response. President George H. W. Bush soon ordered a large military relief operation. More than 20,000 troops set up tent cities, field kitchens and clinics, and the Federal Emergency Management Agency (FEMA) faced sharp criticism that led to its reform under the next administration.

Damage and the insurance crisis

Estimates of the number of people left homeless range from about 160,000 to 250,000. Around 25,000 homes were destroyed and more than 100,000 damaged in Dade County alone, along with schools, shopping centres and the region’s farms and nurseries.

Insured losses reached about 15.5 billion US dollars, far beyond what the industry had planned for. Eleven insurance companies became insolvent, and others stopped writing new policies or withdrew from Florida. The state responded by creating a residential joint underwriting association in 1992 and the Florida Hurricane Catastrophe Fund in 1993, a public reinsurance fund. These later developed into Citizens Property Insurance Corporation, the state-backed insurer of last resort.

Building codes and other lessons

Engineers who examined the wreckage concluded that poor workmanship, weak enforcement and inadequate roof connections explained much of the destruction, not only the strength of the winds. Miami-Dade County tightened its code, requiring tested windows, doors and roofing products that can resist windborne debris. In 2002 Florida replaced its patchwork of local rules with a single statewide Florida Building Code.

Andrew also changed science and planning. The upgrade to Category 5 in 2002 came from a detailed reanalysis using dropsonde data, and the storm helped drive improved wind-damage research and hurricane risk models used by insurers. The name Andrew was retired from the list of Atlantic hurricane names.

Andrew remained the costliest hurricane in US history until Hurricane Katrina struck the Gulf Coast in 2005.

By the numbers

Timeline

• 1992, 16 August: A tropical depression forms in the central Atlantic.
• 1992, 17 August: It strengthens into Tropical Storm Andrew.
• 1992, 22 August: Andrew becomes a hurricane and intensifies rapidly.
• 1992, 23 August: Andrew strikes the northern Bahamas at Category 5 strength.
• 1992, 24 August: Landfall near Homestead, Florida, at about 5 a.m.
• 1992, 26 August: Second landfall in Louisiana as a Category 3 hurricane.
• 1992, 28 August: Andrew’s remnants merge with a frontal system over the south-eastern United States.
• 2002, August: Andrew is officially upgraded to Category 5 at its Florida landfall.

Why it matters

Hurricane Andrew showed how much a single storm striking a populated coast could cost, and how weak construction multiplies that cost. Its legacy of tougher codes, a reformed insurance system and better emergency planning shaped how the United States prepared for the storms that followed along the Gulf and Atlantic coasts. Six years later, Hurricane Mitch showed a different face of hurricane risk, with rain and landslides rather than wind causing most of the deaths.