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(Last updated 08 November 2002)


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Building a Numerical
Weather Prediction System

(click on the figure to view)


The main purpose of the Global Data-processing System (GDPS) shall be to prepare and make available to Members in the most cost-effective way meteorological analyses and forecast products. The design, functions, organizational structure and operations of the GDPS shall be in accordance with Members' needs and their ability to contribute to and benefit from the system.


It is organized as a three-level system of: World Meteorological Centres (WMCs), Regional Specialized Meteorological Centres (RSMCs) and National Meteorological Centres (NMCs), which carry out GDPS functions at the global, regional and national levels, respectively. The GDPS shall also support other WMO Programmes and relevant programmes of other international organizations in accordance with policy decisions of the Organization.

Functions of the GDPS
The real-time functions of the GDPS shall include:
(a)  Pre-processing of data, e.g. retrieval, quality control, decoding, sorting of data stored in a database for use in preparing output products;
(b)  Preparation of analyses of the three-dimensional structure of the atmosphere with up-to-global coverage;
(c)  Preparation of forecast products (fields of basic and derived atmospheric parameters) with up-to-global coverage for one to 10 days ahead;
(d)  Preparation of specialized products such as limited area very fine-mesh short-, medium-, extended-, and long-range forecasts, tailored products for marine, aviation, environmental quality monitoring, and other purposes;
(e)  Monitoring of observational data quality.
(f)  Post-processing of NWP data using workstation and PC based systems with a view to producing tailored value added products and generation of weather and climate forecasts directly from model output.
The non-real-time functions of the GDPS shall include:
(a)  Preparation of special products for climate-related diagnosis (i.e. 10-day or 30-day means, summaries, frequencies and anomalies) on a global or regional scale;
(b)  Intercomparison of analysis and forecast products, monitoring of observational data quality, verification of the accuracy of prepared forecast fields, diagnostic studies and NWP model development;
(c)  Long-term storage of GOS data and GDPS products, as well as verification results for operational and research use;
(d)  Maintenance of a continuously updated catalogue of data and products stored in the system;
(e)  Exchange between GDPS centres of ad hoc information via distributed data bases;
(f)  Conduct of workshops and seminars on the preparation and use of GDPS output products.

Address of the Global Data Processing System (GDPS) Division and contacts at WMO Secretariat :

Mr Morrison Mlaki
Chief, Global Data Processing Systems
      tel. :       +(41 22) 730 8231
      e-mail :   Mlaki_m @ gateway.wmo.ch

Mr Joel Martellet
Scientific Officer
      tel.:        +(41 22) 730 8313
      e-mail :   Martellet_j @ gateway.wmo.ch
Global Data Processing Systems
World Weather Watch Department
World Meteorological Organization
7 bis, rue de la Paix
PO Box 2300
CH-1211 Geneva 2

Fax :    + (41 22) 730 8021

WWW Staff in the Secretariat



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