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🌊 '''Coastal exposure''' describes the concentration of insured assets, populations, and economic activity located within areas vulnerable to coastal perils — [[Definition:Hurricane | hurricanes]], [[Definition:Storm surge | storm surge]], [[Definition:Flood | flooding]], [[Definition:Erosion | erosion]], and rising sea levels — and represents one of the most significant [[Definition:Accumulation risk | accumulation risks]] that [[Definition:Property insurance | property]] and [[Definition:Casualty insurance | casualty]] insurers must manage. In industry parlance, an insurer's coastal exposure is not simply a geographic fact but a quantified measure of [[Definition:Total insured value (TIV) | total insured value]] situated in defined coastal zones, often modeled at granular resolution to capture proximity to the shoreline, elevation, building construction type, and local defense infrastructure.

📐 Carriers quantify coastal exposure through [[Definition:Catastrophe model | catastrophe models]] provided by vendors such as [[Definition:Risk Management Solutions (RMS) | RMS]], [[Definition:AIR Worldwide | AIR Worldwide]], and [[Definition:CoreLogic | CoreLogic]], supplemented by proprietary analytics. These models simulate thousands of potential storm scenarios, translating a portfolio's geographic footprint into probabilistic [[Definition:Loss estimate | loss estimates]] — metrics like [[Definition:Probable maximum loss (PML) | probable maximum loss]] and [[Definition:Average annual loss (AAL) | average annual loss]]. [[Definition:Reinsurance | Reinsurance]] purchasing decisions are heavily driven by these figures; a primary insurer with significant coastal exposure will typically secure [[Definition:Catastrophe excess of loss | catastrophe excess-of-loss]] or [[Definition:Industry loss warranty (ILW) | industry loss warranty]] protection to limit its net retained losses from a single event. Regulators in high-exposure states like Florida and Louisiana also mandate that carriers demonstrate adequate [[Definition:Catastrophe reserve | reserves]] and [[Definition:Reinsurance program | reinsurance programs]] relative to their coastal books.

⚠️ What makes coastal exposure especially challenging today is the compounding effect of [[Definition:Climate change | climate change]] and ongoing coastal development. Insured values along U.S. and global coastlines have surged as populations migrate toward the coast, while warming oceans intensify storm severity and accelerate sea-level rise. This convergence has already contributed to carrier withdrawals from markets like Florida's homeowners' segment and growing reliance on state-backed [[Definition:Residual market | residual market]] mechanisms. For insurers and [[Definition:Reinsurer | reinsurers]] alike, disciplined monitoring and management of coastal exposure is no longer a specialized concern — it is a core determinant of enterprise [[Definition:Solvency | solvency]] and long-term viability.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Catastrophe modeling]]
* [[Definition:Storm surge]]
* [[Definition:Probable maximum loss (PML)]]
* [[Definition:Accumulation risk]]
* [[Definition:Flood insurance]]
* [[Definition:Coastal risk]]
{{Div col end}}

Definition:Coastal exposure - Revision history

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