Rolling Review of Requirements and Statements of Guidance
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(page updated on 04-Oct-2017 )

The Rolling Review of Requirements process

Using the Rolling Review of Requirements (RRR) process defined by the Manual on the Global Observing System (WMO-No. 544) (Part II, Requirements for observational data), user requirements for observations are compared with the capabilities of present and planned observing systems.

User requirements are collated in a comprehensive, systematic and quantitative way in the WMO Observing Requirements database, which attempts to capture observational requirements to meet the needs of all WMO programmes.

The comparison of user requirements with observing system capabilities for a given application area is called a Critical Review. The output of this is reviewed by experts in the relevant application and used to prepare a Statement of Guidance (SOG), the main aim of which is to draw attention to the most important gaps between user requirements and observing system capabilities, in the context of the application. A wide range of applications within WMO programmes have already been addressed.

A more detailed description of the Rolling Requirements Review process is available for download (pdf)

Statements of Guidance (SOG)

For each of the application areas considered, the SOG provides an assessment of the adequacy of observations to fulfill requirements and suggests areas of progress towards improved use of space-based and surface-based observing systems. Only the most significant variables in a given application area have been analyzed in the SOGs.

No. Applications area SoG (link)



Contact point Date of approval
1 Global NWP

Erik Andersson (ECMWF)

June 2016


High Resolution NWP

Thibaut Montmerle (France)

June 2016

3 Nowcasting and Very Short Range Forecasting (see note 1 below)

Paolo Ambrosetti (Switzerland)

June 2015


Sub-seasonal to longer predictions

Yuhei Takaya (Japan)

June 2016

5 Aeronautical Meteorology

Jitze van der Meulen (Netherlands)

June 2016

6 Forecasting Atmospheric Composition (see note 2 below) Oksana Tarasova (WMO) not yet available
7 Monitoring Atmospheric Composition (see note 2 below) Oksana Tarasova (WMO) not yet available
8 Providing Atmospheric Composition information to support services in urban and populated areas (see note 2 below) Oksana Tarasova (WMO) not yet available
9 Ocean Applications

Guimei Liu (China)

June 2016

10 Agricultural Meteorology

Robert Stefanski (WMO)

June 2011

11 Hydrology

Silvano Pecora (Italy )

July 2014


Climate Monitoring (GCOS)
The following GCOS reports are considered as SOG :
  • Status of the Global Observing System for Climate - GCOS 195
  • The Global Observing System for Climate: Implementation Needs - GCOS 200

GCOS Secretariat (gcos[at]


13 Climate Applications (Other aspects, addressed by the Commission for Climatology)

William Wright (Australia)

May 2012

14 Space Weather Terry Onsager (USA) May 2012
15 Climate Science Michel Rixen (WCRP) Not yet available

Although not formally an Application Area, the requirements for Global Cryosphere Watch (GCW) are split between all other Applications Areas. CBS is still discussing the status of the GCW within the Rolling Review of Requirements. For the time being, Mr Etienne Charpentier (WMO Secretariat) is acting as focal point for the GCW.The following GCW documents shall be noted:

1 - Synoptic Meteorology application area has now been merged into the Nowcasting and Very Short Range Forecasting Application Area.

2 - Atmospheric Chemistry application area has been replaced, and split into three new application areas, i.e. (i) Forecasting Atmospheric Composition, (ii) Monitoring Atmospheric Composition, and (iii) Providing Atmospheric Composition information to support services in urban and populated areas. Statements of Guidance for the three new application areas are under preparation. Meanwhile, the old version of the Statement of Guidance for Atmospheric Composition is available here.




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