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The first edition of this guide was published in 1950.
IOM Report, 131. WMO Solid Precipitation Intercomparison Experiment (SPICE) (2012 - 2015)
The Solid Precipitation Intercomparison Experiment (SPICE) was conducted as an internationally coordinated project, initiated and guided by the Commission for Instruments and Methods of Observation (CIMO) of the World Meteorological Organization (WMO). The SPICE field experiments took place between 2013 and 2015, with a preparatory stage during the winter of 2012/13.
SPICE was carried out as a major international effort, and has been remarkable for the diversity of organizations which hosted SPICE tests, contributed with instruments, and were engaged in the data analysis and the derivat ...
WIGOS Technical Report, 2018-01. WIGOS, WMO Integrated Global Observing System - Benefits to the Environment and Society from the Availability and Use of AMDAR Data
This report presents an updated summary of AMDAR data usage and the resulting impacts and benefits to meteorological forecasting and the aviation industry. It then provides a presentation of the environmental and climate applications and studies that also benefit from the use of AMDAR data, as a result, bringing benefits to the environment and wider society. These areas of societal benefits include weather, transportation, energy, disaster reduction, health, climate and agriculture.
IOM Report, 130. Fourth WMO Regional Pyrheliometer Comparison of RA II, Jointly held with RA V
This report describes the intercomparison in detail: the instruments, the participants, the experimental setup, method and procedure, the data analysis technique used and the results. It is clear from the results that all of the participating instruments have been well maintained and remained stable since the previous intercomparison, which augers well for all radiation measurements within RA II and RA V. All participants were able to return home with newly derived WRR reduction factors for their instruments.
Commission for Instruments and Methods of Observations Open Programme Area Group on Remote-Sensing Technologies - Inter-Programme Expert Team on Operational Weather Radars
The key aims of this meeting were to consolidate important activities and plans for completing deliverables within the IPET’s work plan ahead of the upcoming session of CIMO in 2018. In particular, the IPET focused on reinvigorating activities and tasks towards the development of a Best Practices Guide on Operational Weather Radar. The team spent several sessions on developing the improved structure of the guide and drafting and organising materials under that structure. Additionally team members reported on the status and progress of other tasks in the work plan, including the successful comp ...
Commission for Instruments and Methods of Observations OPAG in situ Technologies and Intercomparisons - Expert Team on Aircraft-based Observations : Final Report
The second session of the CIMO Expert Team on Aircraft-based Observations took place over 16-19 April, 2018 at the WMO headquarters in Geneva, Switzerland. This was the 2nd meeting of the team during the current inter-sessional period of CIMO ahead of the upcoming session of CIMO in October, 2018 (CIMO-17), with the first session having been held in December 2015 in conjunction with the CBS Expert Team on Aircraft-Based Observing Systems second session. The chief focus for the session was for the team to report on progress and to undertake planning to finalise activities and tasks from its wor ...
IOM Report, 128. Interlaboratory Comparison in the field of Temperature, Humidity and Pressure, in the WMO Regional Association VI (MM-ILC-2015-THP)
The subject of this report is evaluation of the interlaboratory comparison in the field of measurement of temperature, humidity and pressure. The interlaboratory comparison was held within the framework of the MeteoMet 2 project, in the scope of proficiency testing scheme organized by the University of Ljubljana, Faculty of Electrical Engineering, Laboratory of Metrology and Quality (UL-FE/LMK), except pressure part. All the analysis were done in accordance with accredited procedures.
Guidelines for Nowcasting Techniques
The purpose of the WMO nowcasting guidelines presented here is to help National Meteorological and Hydrological Services (NMHSs) by providing them with information and knowledge on how to implement a nowcasting system with the resources available to them and an understanding of the current state of science and technology.
Handbook on Use of Radio Spectrum for Meteorology : Weather, Water and Climate Monitoring and Prediction
World Meteorological Organization (WMO) ; International Telecommunication Union (ITU) - WMO, 2017 (WMO-No. 1197)The Handbook provides comprehensive technical and operational information on current observation applications and systems and on the use of radio frequencies by meteorological systems, including meteorological satellites, radiosondes, weather radars, wind profiler radars and spaceborne remote sensing instruments. It is intended for the meteorological (i.e. weather, water and climate) and radiocommunication communities, including governmental institutions, industry as well as the general public.
Commission for Basic Systems Open Programme Area Group on Integrated Observing Systems, Expert Team on Aircraft-Based Observing Systems: final report
This meeting was a particularly important one for the expert team, being the first opportunity to openly and formally discuss the possible future collaboration between WMO and the International Air Transport Association (IATA) on the operation of the AMDAR programme. While the discussion raised a number of issues to be subsequently addressed, the team welcomed and fully endorsed the establishment of the IATA-WMO Working Arrangement that had been approved by the 69th session of the WMO Executive Council and agreed to undertake to work with IATA on the development of the proposed Concept of Oper ...
Commission for Instruments and Methods of Observations Open Programme Area Group on Remote-Sensing Technologies - Inter-Programme Expert Team on Operational Weather Radars : final report
The First Session of the Commission for Instruments and Methods of Observations (CIMO), Inter-Programme Expert Team on Operational Weather Radars (IPET-OWR) was held over 13 to 16 March, 2017, at the Japan Meteorological Agency (JMA) headquarters in Tokyo, Japan. The session was kindly hosted by JMA and generously supported by Japan. The meeting was opened by the Director-General of the Japan Meteorological Agency, Dr Toshihiko Hashida, who highlighted Japan’s ongoing engagement in international operational weather radar activities, collaboration and capacity development. The session was chair ...
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Part I. Measurement of meteorological variables (2014 Edition) 
Volume IV – Space-based Observations (2018 Edition) 
