Non-Life Windstorm Zone WSI

Non-Life Windstorm Zone WSI

Article 121 requires zone-level weighted sum insured before regional windstorm correlation and the gross event-sequence uplift are assessed.^[1] The WSI amount is an exposure-preparation input for the selected windstorm risk zone, not a standalone capital requirement.

Inputs

• Region: The Annex V region used to deduce the windstorm risk factor Q.
• Annex IX - Zone: The selected windstorm risk zone for that region.
• Region Risk Factor Q: The read-only region-level multiplier deduced from Annex V.
• Zone Risk Weight W: The read-only zone risk-weight multiplier deduced from Annex X.
• Property Sum Insured: Property sum insured for covered windstorm obligations in the zone.
• Onshore Property Sum Insured: Onshore property sum insured for covered windstorm obligations in the zone.
• Lower Amount Cap: Optional cap reflecting the lower potential loss amount for the zone.

Calculation

The zone sum insured combines property and onshore property. The uncapped WSI then applies the regional factor and zone risk weight to that sum insured, with the optional lower amount cap applied when it binds.

Important Notes

• Exposure Boundary: The Windstorm Zone WSI output is a weighted-sum-insured input for the selected peril zone. It is not final SCR and should not be treated as a standalone supervisory deviation or reporting conclusion.
• Evidence Boundary: Region mapping, zone selection, sum-insured source schedules, onshore-property treatment, and any lower amount cap should remain traceable before regional aggregation.