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Research | Meteorology - Modelling
Atmospheric modelling
The model used for production of short range numerical weather predictions at Finnish Meteorological Institute (FMI) is HIRLAM (High Resolution Limited Area Model). It has been developed co-operatively by nine European countries, Finland, Sweden, Norway, Denmark, Iceland, the Netherlands, Ireland, Spain, and Estonia. There is also close co-operation with France.
The model development takes place within the framework of the international HIRLAM program. FMI's main contribution to the project include the development of data assimilation system, use of remote sensing data, and the development of physical parametrizations of the model. Since 2003, FMI has also acted as the Lead Center for the RCR (Regular Cycle with the Reference) runs, within which capacity it has the special duty of running the official reference version of the Hirlam as its operational weather forecast model.
The HIRLAM model has been used operationally since 1990. At present, four 48 hour regional forecasts and four 48 hour mesoscale forecasts for the Northern Europe are produced daily (RCR and MBE, respectively; see the operational areas below). In addition, a very high resolution model (Arome) being developed in co-operation between Hirlam and Meteo France is used in forecast production with pre-operational status.
Technical description of HIRLAM as well as of weather forecast models used by other countries and institutes can be found from WMO's technical report page.
Hirlam development related research
- Mesoscale model: Development in co-operation with Meteo France, LAPSE model studies and implementation
- Data assimilation system: Utilisation of radar winds, study of slant delay observation errors
- Physical parametrisations of the model: Radiation on slanted surfaces, surface orography, precipitation formation physics
- Cloud dynamics: The formation of mesoscale convective systems
Operational integration areas of the FMI HIRLAM runs
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