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🌊 '''Storm surge''' is the abnormal rise of ocean water driven ashore by a [[Definition:Hurricane | hurricane]], tropical storm, or other intense coastal weather system, and it represents one of the most destructive and costly [[Definition:Peril | perils]] that [[Definition:Property insurance | property insurers]] must evaluate when writing coastal risks. Unlike gradual tidal flooding, storm surge can push walls of water many feet above normal sea level in a matter of hours, inundating buildings, vehicles, and infrastructure over wide swaths of coastline. For the insurance industry, surge is particularly significant because it often falls outside the scope of standard [[Definition:Homeowners insurance | homeowners]] and [[Definition:Commercial property insurance | commercial property policies]], which typically exclude [[Definition:Flood exclusion | flood]], and instead must be covered — if at all — through the [[Definition:National Flood Insurance Program (NFIP) | National Flood Insurance Program]] or [[Definition:Private flood insurance | private flood markets]].

🔬 [[Definition:Catastrophe modeling | Catastrophe modelers]] simulate storm surge by coupling atmospheric hurricane models with hydrodynamic ocean models that account for coastal topography, bathymetry, and tidal conditions. Firms such as those providing [[Definition:Catastrophe model | catastrophe models]] to the industry generate detailed inundation maps that estimate water depth at a granular, property-level resolution for thousands of hypothetical storm tracks. Insurers and [[Definition:Reinsurance | reinsurers]] rely on these outputs to set [[Definition:Rate | rates]], establish [[Definition:Sub-limit | sub-limits]], and structure their [[Definition:Reinsurance program | reinsurance programs]] for [[Definition:Wind | wind]]-exposed coastal portfolios. The challenge is compounded by the interaction between surge and other perils during a single event: a hurricane may cause wind damage, surge flooding, and rainfall-driven inland flooding simultaneously, creating complex [[Definition:Causation | causation]] disputes about which policy or peril responds.

⚠️ Rising sea levels and increasing coastal development have amplified the insurance industry's exposure to storm surge over the past two decades. After events like Hurricanes Katrina and Sandy — where surge losses dwarfed wind damage in many areas — insurers and regulators placed renewed emphasis on distinguishing wind from water damage, tightening [[Definition:Policy language | policy language]], and ensuring that pricing reflects the true surge hazard. [[Definition:Insurtech | Insurtech]] companies have introduced high-resolution geospatial analytics and real-time monitoring tools that help [[Definition:Underwriting | underwriters]] assess surge risk at the individual property level. For any insurer writing coastal business, understanding and appropriately pricing storm surge is not optional — it is a [[Definition:Solvency | solvency]]-level concern.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Catastrophe modeling]]
* [[Definition:Flood insurance]]
* [[Definition:National Flood Insurance Program (NFIP)]]
* [[Definition:Hurricane]]
* [[Definition:Coastal risk]]
* [[Definition:Probable maximum loss (PML)]]
{{Div col end}}

Definition:Storm surge - Revision history

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