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🌪️ '''Natural catastrophe (nat cat)''' refers to a large-scale, naturally occurring event — such as a hurricane, earthquake, flood, or wildfire — that causes widespread insured losses significant enough to affect the financial results of [[Definition:Insurance carrier | insurers]], [[Definition:Reinsurer | reinsurers]], and the broader [[Definition:Capital markets | capital markets]] tied to risk transfer. In insurance and reinsurance, the term carries a precise operational meaning: a nat cat is not simply any natural event but one that triggers aggregate losses across multiple [[Definition:Policy | policies]] and geographic zones, often exceeding predefined [[Definition:Catastrophe threshold | catastrophe thresholds]] set by modeling firms or regulators. The distinction matters because nat cat events drive much of the volatility in [[Definition:Property catastrophe reinsurance | property catastrophe reinsurance]] pricing and capacity.

📊 Insurers and reinsurers rely heavily on [[Definition:Catastrophe model | catastrophe models]] developed by firms like RMS, AIR, and CoreLogic to estimate potential nat cat losses before events occur. These models simulate thousands of hypothetical scenarios to produce [[Definition:Probable maximum loss (PML) | probable maximum loss]] estimates, which feed directly into [[Definition:Underwriting | underwriting]] decisions, [[Definition:Reinsurance program | reinsurance program]] design, and [[Definition:Capital adequacy | capital adequacy]] calculations. When a nat cat strikes, [[Definition:Claims adjuster | claims adjusters]] are deployed en masse, [[Definition:Loss reserve | loss reserves]] are established, and the event's insured losses ripple through [[Definition:Retrocession | retrocession]] markets and [[Definition:Insurance-linked security (ILS) | insurance-linked securities]]. Post-event, [[Definition:Loss development | loss development]] can continue for years as claims are settled and litigated.

💡 The financial impact of nat cat events extends far beyond individual claim payouts — they reshape entire market cycles. A year of heavy nat cat activity can harden [[Definition:Reinsurance rate | reinsurance rates]], attract fresh capital from [[Definition:Alternative capital | alternative capital]] providers, and prompt regulators to revisit [[Definition:Solvency | solvency]] requirements. Conversely, years with low nat cat losses can soften pricing and encourage aggressive capacity deployment. For [[Definition:Chief underwriting officer (CUO) | chief underwriting officers]] and portfolio managers, understanding nat cat exposure is arguably the single most critical dimension of [[Definition:Risk management | risk management]] in property lines. As climate patterns shift, the frequency and severity of certain perils — particularly secondary perils like convective storms and wildfires — are forcing the industry to recalibrate longstanding assumptions about nat cat risk.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Catastrophe model]]
* [[Definition:Property catastrophe reinsurance]]
* [[Definition:Probable maximum loss (PML)]]
* [[Definition:Insurance-linked security (ILS)]]
* [[Definition:Aggregate excess of loss]]
* [[Definition:Natural disaster]]
{{Div col end}}

Definition:Natural catastrophe (nat cat) - Revision history

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