Sensivity of site specific forecast model performance to vertical resolution, model timestep and forcing data
Sheffield P.M. ; Hopwood W.P.
The Site Specific Forecast Model (SSFM) is a 1-D version of the Unified Model, which provides the capability to produce site specific forecasts, taking into account localised effects. The SSFM is driven by 3-D output from operational NWP models and has increased vertical resolution in the boundary layer, in addition to other modifications, which increase the skill and accuracy of the forecast. The aim of this work is to investigate the sensitivity of the SSFM to vertical resolution and the timestep used within the model itself. Operationally the SSFM is driven by output from a UK Mesoscale model however NWP output is available from global NWP, giving the SSFM a global capability. Different configurations of the SSFM were created, by varying the number of vertical levels and adjusting the timestep resolution within the model and the performance of the configurations using different forcing data was investigated. The primary aim is to find an optimum configuration which provides a high quality forecast at low computational costs. Firstly ...
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