KNMI projects Water levels Harmonie

Meteorological forcing

Case studies

Harmonie for Storm Surge Forecasts

Introduction

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.

Model domain

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.
Hans de Vries, © KNMI, June 12, 2018