Known Issue 337

Demand surge is miscalculated for some events in the Verisk Hurricane Model for the United States when using the "50 K U.S. AP (2020) - Warm SST Conditioned Hurricane" or the "50 K U.S. AP (2020) - WSST Conditioned Hurricane - Severe Thunderstorm CAT only" event sets. This known issue does not impact any 10 K or 100 K catalogs for this U.S. hurricane model.

Issue ID	337
Summary	Demand surge is miscalculated for some events in the Verisk Hurricane Model for the United States when using the "50 K U.S. AP (2020) - Warm SST Conditioned Hurricane" or the "50 K U.S. AP (2020) - WSST Conditioned Hurricane - Severe Thunderstorm CAT only" event sets. This known issue does not impact any 10 K or 100 K catalogs for this U.S. hurricane model.
Description	An error was introduced in 9.0 where the demand surge calculation is using the incorrect industry losses for some events in the Verisk Hurricane Model for the U.S. only with the 50 K Warm Sea Surface Temperature catalog. Effects will vary depending on the exposure, but a representative book showed overall differences in AAL on the order of 1-2% and > 0.5% of events with a loss difference of more than 5%. Analyses using any other size or type of catalog are unaffected by this issue.
Resolved in	Touchstone 2022
Date posted	3/22/2022
Software versions affected	9.1, 9.0
Feature set	Detailed loss
Models	Verisk Hurricane Model for the United States
Potential for loss numbers impact	Yes
Workaround	Demand surge is calculated appropriately in the first 50 K years of the 100k WSST catalog.