Harmonie for Storm Surge Forecasts
The new standard model for regional weather forecasting is Harmonie. The intend is to
replace the use of Hirlam data in all applications by Harmonie. One such application is
storm surge forecasting up to 48 hours ahead.
For the validation of Harmonie input, the model has been rerun for a number of storm surge
cases in the past and the results are being used in the storm surge models: WAQUA/DCSMv6
and also WAQUA/DCSMv5.
The domain of the Harmonie model as used by KNMI is not large enough for even the previous
version of the storm surge model (DCSMv5). Therefore, Harmonie data have to be extended
to cover the complete domain of the storm surge model.
For the extension, data of the model that supplies the lateral boundary conditions
for Harmonie itself can be used. Harmonie (as of version 38) takes its boudary conditions
directly from the ECMWF IFS model, which are readily available from the ECMWF MARS archive.