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🌪️ '''Natural catastrophe (Nat cat)''' refers to a large-scale, naturally occurring event — such as a hurricane, earthquake, flood, wildfire, or tsunami — that causes widespread insured losses across a geographic area. In the insurance and [[Definition:Reinsurance | reinsurance]] industry, nat cat is one of the most consequential categories of [[Definition:Loss event | loss exposure]], driving the structure of [[Definition:Catastrophe reinsurance | catastrophe reinsurance]] programs, shaping [[Definition:Underwriting | underwriting]] strategy, and influencing the pricing cycle across property markets worldwide. Unlike attritional losses that emerge predictably from a diversified book, nat cat events are characterized by their low frequency, high severity, and spatial correlation — meaning a single event can simultaneously trigger claims across thousands or millions of policies.

⚙️ Insurers and reinsurers manage nat cat exposure through a layered approach combining [[Definition:Catastrophe model | catastrophe modeling]], geographic [[Definition:Risk aggregation | aggregation]] controls, reinsurance purchasing, and access to [[Definition:Insurance-linked securities (ILS) | insurance-linked securities]] such as [[Definition:Catastrophe bond | catastrophe bonds]]. Proprietary and vendor models from firms like [[Definition:Moody's RMS | RMS]], [[Definition:AIR Worldwide | AIR Worldwide]], and [[Definition:CoreLogic | CoreLogic]] simulate thousands of hypothetical event scenarios to estimate probable maximum losses at various [[Definition:Return period | return periods]]. Regulatory frameworks also impose specific requirements: [[Definition:Solvency II | Solvency II]] in Europe mandates that insurers hold capital sufficient to withstand a 1-in-200-year event, while the [[Definition:National Association of Insurance Commissioners (NAIC) | NAIC]]'s [[Definition:Risk-based capital (RBC) | RBC]] framework in the United States and [[Definition:China Risk Oriented Solvency System (C-ROSS) | C-ROSS]] in China each incorporate catastrophe risk charges calibrated to local peril landscapes. In Japan, the earthquake insurance system involves a government-backed pool, reflecting the unique seismic exposure of that market.

💡 Few forces shape the global insurance cycle as powerfully as nat cat activity. A cluster of severe years — such as the 2017 Atlantic hurricane season or the 2011 Tōhoku earthquake and Thai floods — can erode industry capital, harden [[Definition:Reinsurance pricing | reinsurance pricing]], and trigger reassessment of risk appetites across the market. Conversely, prolonged periods of benign activity can attract new capital and compress margins. The growing influence of [[Definition:Climate change risk | climate change]] on the frequency and intensity of certain perils — particularly wildfire, convective storms, and flooding — has made nat cat exposure a central topic in regulatory stress testing, [[Definition:Enterprise risk management (ERM) | enterprise risk management]], and [[Definition:ESG (Environmental, social, and governance) | ESG]] disclosure. Accurately pricing, modeling, and transferring nat cat risk remains one of the defining challenges of the property insurance and reinsurance industry.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Catastrophe model]]
* [[Definition:Catastrophe bond]]
* [[Definition:Catastrophe reinsurance]]
* [[Definition:Probable maximum loss (PML)]]
* [[Definition:Insurance-linked securities (ILS)]]
* [[Definition:Climate change risk]]
{{Div col end}}

Definition:Natural catastrophe (Nat cat) - Revision history

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