Institut National de la Météorologie
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Research & Development / ALADIN : short-term numerical prediction

Recherche et developpement
Research & Development
ALADIN : short-term   numerical prediction

Numerical Weather Prediction Project

Genesis of the project
Willing to experiment, operate, and use a close-meshed, limited prediction model at a much smaller spatial scale than could be provided by the currently used global models, NIM in 2001 joined ALADIN (Aire Limitée, Adaptation dynamique, Développement InterNational). The project was launched by Météo-France in 1991 with the objective of building mutual cooperation in the field of Numerical Weather Prediction (NWP) between the national meteorological services of Eastern and Central Europe and Morocco.
About a hundred scientists from the fifteen partner countries have been constructing the ALADIN NP system (more than 250 person-year of work in the first 10 years of the project) which functions everyday on various platforms, from PC-clustering using Linux to vectorial computers.


   Establish a numerical weather prediction chain at NIM.
   Promote numerical weather prediction on a limited domain in Tunisia by means of installation, maintenance, and development of a version of ALADIN Model specially adapted to the geographic and climatic features of Tunisia in order to provide precise prediction in line with socio-economic practice and habits in Tunisia.

ALADIN Partners
1991 : At the start of the project there were seven countries : Austria, Bulgaria, France, Hungary, Poland, Czech Republic, Romania. Then other partners joined.
1993 : Morocco, Slovakia, Slovenia.
1995 : Croatia.
1996 : Belgium, Moldavia.
1997 : Portugal.
2001 : Tunisia.

    Zentralanstalt für Meteorologie und Geodynamik (Austria)
    Bulgarian National Institute for Meteorology and Hydrology (Bulgaria)
    Météo-France (France)
    Hungarian Meteorological Service (Hungary)
    Institute of Meteorology and Water Management of Poland (Poland)
   Czech Hydrometeorological Institute (Czech Republic)
    Romanian National Institute for Meteorology and Hydrology (Roumania)
    Direction de la Météorologie Nationale du Maroc (Morocco)
    Slovak Hydrometeorological Institute (Slovakia)
    Hydrometeorological Institute of Slovenia (Slovenia)
    Croatian Meteorological and Hydrological Service (Croatia)
    Institut Royal Météorologique de Belgique (Belgium)
    Moldavian Hydrometeorological Service (Moldavia)
    Portuguese Meteorological Institute (Portugal)
    Institut National de la Météorologie (Tunisia)

Project duration
2 years for model installation (2001-2003).

Expected results
    Prepare and operate an NP system to be used in a limited geographic area in Tunisia with possible zoom effect in relation to ARPEGE coupler model.
    Work on small domains with high spatial resolution.
    Produce a top-level tool as a real contribution to the development of a common NP to be used by all partners .

Ongoing activities
    A first pre-operational version of Tunisia-adapted ALADIN Model was installed on Météo-France computers at Toulouse in September 2001, and an extract by domain is daily sent to Tunis via Internet.
    The output of ALADIN Model is used from afar by NIM prediction engineers and is therefore subject to double assessment.
    Some tools and interfaces have been designed by the NP team, thus allowing prediction engineers to be better acquainted with the model.
    An objective forecast control procedure has also been set up for the major fields of particular weather .
    In 2002, NIM purchased a high performance computer to locally operate the ALADIN -Tunisia numerical prediction chain .
    A plan dealing with the different scientific aspects of the ALADIN -Tunisia version has been elaborated for the 2002-2005 period, and after discussion, the following topics were retained :
Evaluation of convection schemata in semi-arid areas.
Study of thin layer hypothesis relaxation based on ALADIN.
Definition of ALADIN surface characteristics.
Setting up an observation management system upstream of ALADIN.


Copyright INM - 2003