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The choice of the thresholds is based on the work done for WISC. The Storm Severity Index is defined as:
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SSI$$SSI = A \ast [mean(u_{10m} > threshold)]^3^3$$ |
Where A is the area over land in km2 and 𝑢10𝑚 is 10m wind speed from the reanalysis data. This is equivalent to the SSI used in Dawkins et al., (2016).
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This is calculated by applying a regional mask and then a wind speed threshold mask to the ERA5 10m winds. For the resulting wind speeds the maximum is taken and average per season computed. This gives an indication of the highest land-only 10m wind speed which could be experienced in a country.
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Storm Severity Index (SSI) is defined as:
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SSI$$SSI = A \ast [mean(u_{10m}>threshold > threshold)]^3^3$$ |
Where A is the area over land in km2 and 𝑢10𝑚 is 10m wind speed calculated from the re-analysis data. This is equivalent to a definition of SSI used in Dawkins et al., (2016), with the only difference being the threshold of 10m wind speed used. This metric is also calculated from the land masked, and the ERA5 masked wind speeds.
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M. A., Thornton, H. E., and Youngman, B. D. (2014) The XWS open access catalogue of extreme European windstorms from 1979 to 2012, Nat. Hazards Earth Syst. Sci., 14, 2487-2501
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This document has been produced in the context of the Copernicus Climate Change Service (C3S). The activities leading to these results have been contracted by the European Centre for Medium-Range Weather Forecasts, operator of C3S on behalf of the European Union (Delegation agreement Agreement signed on 11/11/2014 and Contribution Agreement signed on 22/07/2021). All information in this document is provided "as is" and no guarantee or warranty is given that the information is fit for any particular purpose. The users thereof use the information at their sole risk and liability. For the avoidance of all doubt , the European Commission and the European Centre for Medium - Range Weather Forecasts have no liability in respect of this document, which is merely representing the author's view. |
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