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(Last updated 23 April 2004)

Updated 7 Aug 2003  

WMO No. 485
Manual on the GDPFS
Volumes I and II

GDPS-process-small.gif (14848 bytes)

Building a Numerical
Weather Prediction System

(click on the figure to view)

Global Producing Centres of Seasonal to Interannual Forecasts
(July 2003)

Verification Systems
for Long-range Forecasts

Ensemble Prediction System (EPS)

Data Monitoring Index

Definitions of Meteorological
Forecasting Ranges
Arrangements for Meteorological Assistance to UN Humanitarian Missions

GDPFS contact at WMO Secretariat



The main purpose of the Global Data-processing and Forecasting Systems (GDPFS) 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 GDPFS 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 GDPFS functions at the global, regional and national levels, respectively. The GDPFS shall also support other WMO Programmes and relevant programmes of other international organizations in accordance with policy decisions of the Organization.

Functions of the GDPFS
The real-time functions of the GDPFS 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 GDPFS 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 GDPFS 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 GDPFS centres of ad hoc information via distributed data bases;
(f)  Conduct of workshops and seminars on the preparation and use of GDPFS output products.

Contact at WMO Secretariat

Mr Joel Martellet
Scientific Officer

Tel.:    +(41 22) 730 8313
Fax:     +(41 22) 730 8021
Global Data Processing and
   Forecasting Systems Division
WMO/WWW Basic Systems
7 bis, rue de la Paix
PO Box 2300
CH-1211 Geneva 2

Please note, 
Mr Morrison Mlaki
, Chief, GDPS Division, 
retired from WMO in October 2003.
In the interim, you may  contact the 
Office of the Director, WWW-Basic Systems
for queries concerning any of the programmes that Mr Mlaki was responsible for.

WWW Staff in the Secretariat

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