European winter storm WISC

src/hazard/onboard/wisc_european_winter_storm.md

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+Maximum 10 metre 3 second gust peak wind speed (note 3 second average; by default physrisk wind speeds are 1 minute average) for different return periods, inferred from the Copernicus WISC European storm event set. This allows events and return period maps to be used consistently.
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+https://cds.climate.copernicus.eu/datasets/sis-european-wind-storm-synthetic-events?tab=overview
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+The WISC dataset contains a set of synthetic windstorm events consisting of 22,980 individual
+storm footprints over Europe. These are a physically realistic set of plausible windstorm
+events based on the modelled climatic conditions, calculated using the Met Office HadGEM3 model
+(Global Atmosphere 3 and Global Land 3 configurations).
+Return period maps of peak gust wind speed are inferred from this data.