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🌀 '''Hurricane season''' refers to the annually recurring period during which tropical cyclone activity is most likely to produce [[Definition:Catastrophe loss | catastrophe losses]] for the insurance and [[Definition:Reinsurance | reinsurance]] industry. In the North Atlantic basin — the region of greatest consequence for U.S. property insurers and the global [[Definition:Catastrophe reinsurance | catastrophe reinsurance]] market — the season officially runs from June 1 through November 30, as designated by the National Oceanic and Atmospheric Administration (NOAA). Other basins follow different calendars: the Eastern Pacific season mirrors the Atlantic, while the Northwest Pacific typhoon season and Southern Hemisphere cyclone season have their own peak periods, all carrying significant implications for insurers and reinsurers with exposures in those regions.

📊 The insurance industry's annual rhythm is deeply shaped by hurricane season. In the months leading up to June, [[Definition:Catastrophe modeling | catastrophe modeling]] firms such as [[Definition:Moody's RMS | Moody's RMS]], [[Definition:Verisk | Verisk]], and [[Definition:CoreLogic | CoreLogic]] issue updated model versions and seasonal forecasts that feed directly into [[Definition:Underwriting | underwriting]] decisions, [[Definition:Reinsurance treaty | reinsurance treaty]] negotiations, and [[Definition:Insurance-linked securities (ILS) | ILS]] pricing. [[Definition:Reinsurer | Reinsurers]] and [[Definition:Retrocessionaire | retrocessionaires]] calibrate their [[Definition:Aggregate limit | aggregate limits]], [[Definition:Reinstatement | reinstatement]] provisions, and [[Definition:Retrocession | retrocession]] purchases around expected seasonal severity. Major renewals — particularly the January 1 and June/July reinsurance treaty cycles — are priced with explicit reference to the upcoming or recently concluded season. During the season itself, real-time storm tracking triggers [[Definition:Pre-event preparation | pre-event]] preparations: carriers activate [[Definition:Claims management | claims]] surge plans, [[Definition:Catastrophe response team | catastrophe response teams]] pre-position resources, and trading in [[Definition:Catastrophe bond | catastrophe bonds]] and [[Definition:Industry loss warranty (ILW) | industry loss warranties]] reflects shifting probabilities of landfall and loss.

🏗️ Historically, a single active hurricane season can reshape the insurance landscape for years. The 2005 Atlantic season — marked by Hurricanes Katrina, Rita, and Wilma — produced the largest insured catastrophe losses the industry had experienced at that point, driving a hard-market turn, accelerating the growth of the ILS market, and prompting fundamental revisions to catastrophe models and building codes. More recently, the 2017 season (Harvey, Irma, Maria) and the 2022 season (Ian) each triggered multi-billion-dollar [[Definition:Insured loss | insured losses]] that tested reinsurance capacity and contributed to significant [[Definition:Rate hardening | rate hardening]]. For insurers operating in hurricane-exposed territories — from the U.S. Gulf and Atlantic coasts to the Caribbean, Mexico, Japan, and the Philippines — hurricane season is not merely a weather phenomenon but the defining risk event around which [[Definition:Capital management | capital planning]], [[Definition:Reserving | reserving]], and strategic positioning revolve.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Catastrophe loss]]
* [[Definition:Catastrophe modeling]]
* [[Definition:Catastrophe reinsurance]]
* [[Definition:Catastrophe bond]]
* [[Definition:Windstorm insurance]]
* [[Definition:Aggregate exceedance probability (AEP)]]
{{Div col end}}

Definition:Hurricane season - Revision history

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