Hurricane Sandy was a large and unusual Atlantic tropical cyclone that developed in late October 2012 and caused extensive destruction across the Caribbean, the U.S. Mid‑Atlantic and Northeast, and parts of eastern Canada. Emerging from a tropical wave in the western Caribbean Sea, the system intensified rapidly and became one of the largest Atlantic storms on record by diameter. Its broad wind field and interaction with a mid‑latitude trough led to an extensive storm surge, heavy rainfall, and severe coastal flooding in several densely populated regions.

Meteorological history and characteristics

The disturbance that became Sandy organized into a tropical depression on October 22, 2012, and became a named storm within hours. It moved northward through the Greater Antilles, making landfall in Jamaica and later striking eastern Cuba, where it reached major‑hurricane strength. After passing the Bahamas, the cyclone turned toward the U.S. northeast. As it approached the mid‑Atlantic, Sandy expanded in size and transitioned into a post‑tropical system through interaction with a cold front and upper‑level trough, producing hurricane‑force winds across a wide area even where its core had lost tropical structure.

Records and notable features

Sandy is notable for its exceptional size: the storm’s tropical‑force winds extended out hundreds of miles from its center, making it the largest Atlantic hurricane in diameter in modern records. Its unusual path — combining tropical and extratropical dynamics — and late‑season timing contributed to a powerful storm surge on the mid‑Atlantic coast. The combination of surge, waves, and heavy precipitation produced flooding at levels rarely seen in parts of New Jersey, New York, and Long Island.

Impacts, damage, and human consequences

The storm caused widespread power outages, destroyed or damaged thousands of homes, and disrupted transportation and utilities. Urban areas experienced significant infrastructure failures; in New York City, subway tunnels and low‑lying streets were inundated, major airports closed, and fuel and food supplies were interrupted in affected communities. Sandy resulted in loss of life in the Caribbean and in North America and forced large‑scale evacuations. Economic losses were substantial, placing the event among the costliest Atlantic storms, with recovery and rebuilding lasting for months to years in many communities.

Response, recovery, and legacy

Local, state, and national governments declared emergencies prior to landfall and mobilized resources for rescue, relief, and recovery. The storm highlighted vulnerabilities in coastal planning, power distribution, and urban infrastructure and prompted changes to emergency preparedness and mitigation practices. Sandy’s impacts were a catalyst for long‑term investments in resilience, including revised flood maps, strengthened building codes in some jurisdictions, and projects to better protect critical infrastructure from future coastal storms.