|I. World Meteorological Centres (WMCs)
These shall consist of centres applying sophisticated high-resolution global NWP
models and preparing for distribution to Members and other GDPS centres the following
(a) Global (hemispheric) analysis products;
(b) Short-, medium-, extended- and long-range forecasts and
products with a global coverage, but presented separately, if required, for:
(i) The tropical belt;
(ii) The middle and high
latitudes or any other geographical area according to Members requirements;
(c) Climate-related diagnostic products, particularly for tropical
WMCs shall also carry out verification and intercomparison of products, support the
inclusion of research results into operational models and their supporting systems, and
provide training courses on the use of WMC products.
II. Regional Specialized Meteorological Centres (RSMCs)
A. Centres with geographical
These shall be either existing national or regional centres which have accepted
responsibilities by multilateral or regional agreement, or centres implemented by a joint
cooperative effort by several countries in a Region.
The functions of RSMCs with geographical specialization shall include:
(a) Providing the interface between WMCs and NMCs by formatting and
distributing global products to meet the needs in a particular Region;
(b) Providing regional analysis and forecast products for
1248 hours, for designated areas;
(c) Providing meteorological assistance to United Nations
humanitarian missions, in the event the relevant associated NMC is facing an emergency or
is in catastrophic distress and out of service, as specified in Appendix I-5;
(d) Coordinating with other RSMCs as appropriate.
B. Centres with activity specialization
The functions of RSMCs with activity specialization shall include, inter alia:
(a) Providing long-, extended- and/or medium-range forecasting
(b) Providing advisories for tropical cyclones, severe storms and
other dangerous weather phenomena;
(c) Providing tailored specialized products to service users in a
(d) Providing trajectories or dispersion of pollutants in case of
(e) Providing information on prolonged adverse weather conditions,
including drought monitoring;
(f) Undertaking activities related to the WCP and other WMO
international programmes. This includes providing climate diagnostic, climate analysis and
prediction products to assist in climate monitoring.
RSMCs shall also carry out verification and intercomparison of products and arrange
regional workshops and seminars on centres products and their use in national
weather forecasting. RSMCs with geographical and activity specialization shall be
co-located where possible.
RSMCs designated by WMO for the provision of
atmospheric transport model products for environmental emergency response shall implement
the regional and global arrangements and related procedures in Appendix I-3.
The designated WMCs and RSMCs are given in Appendix I-1 and the procedures for broadening
the functions of existing RSMCs and for designating new RSMCs are given in Appendix I-2.
Regional and global arrangements for the provision of transport model products for
environmental emergency response are given in Appendix I-3.
Note: Guidelines to review the status of RSMCs with geographical
specialization are given in Attachment I.1.
III. National Meteorological Centres (NMCs)
The NMCs carry out functions to meet their national and international requirements.
Typically, the functions of NMCs include the preparation of:
(a) Nowcasts and very short-range forecasts;
(b) Short-, medium-, extended- and long-range forecasts by applying
objective or subjective interpretation methods to products received from World and
Regional Specialized Meteorological Centres or by integrating regional models using
boundary conditions based on these products;
(c) Special application-user products, including warnings of severe
weather, climate and environmental quality monitoring and prediction products;
(d) Specific products and their delivery in support of United
Nations humanitarian missions as specified in Appendix I-5;
(e) Non-real-time climate-related analyses and diagnosis.
NMCs should be linked via suitable terminals to computer systems at other GDPS centres in
order to carry out inter-processing activities between centres, according to bilateral or
multilateral agreements among Members.
The definition of forecast ranges is given in Appendix I-4.
The basic organization of the GDPS is also given in Chapter A.2.1 of the Technical
(1) The national data-processing activities may also be concerned
with large-scale analyses and forecasts.
(2) Detailed specifications of the real-time and non-real-time
functions of WWW centres are given in Parts II and III, respectively.
(3) Procedures for the elaboration of observational data
requirements are given in Attachment I.2.
(4) In some instances, WMCs, RSMCs and NMCs are co-located and the
functions of one centre are included in those of the other.
The above functions of the various centres shall not affect the status of
any international commitments of Members for support to shipping and aviation, nor
determine the manner in which Members execute these responsibilities.