About the Manual on Codes Volume I.2
Manual on Codes (WMO-No. 306), Volume I.2 - Part B and Part C
Annex II to the WMO Technical Regulations
Coded messages are used for the international exchange of meteorological information comprising observational data provided by the WMO Integrated Global Observing System and processed data provided by the WMO Integrated Processing and Prediction System (formerly Global Data-processing and Forecasting System). Coded messages are also used for the international exchange of observed and processed data required in specific applications of meteorology to various human activities and for exchanges of information related to meteorology.
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Download from the WMO library
Manual on Codes (WMO-No. 306), Volume I.2 [2023 edition]
Download provisional copy
Manual on Codes (WMO-No. 306), Volume I.2 [2025 provisional]
This 2025 provisional copy includes amendments from the following fast-track approvals: FT2023-2, FT2024-1, FT2024-2.
Download machine-readable codes
The latest version of the machine-readable codes.
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View amendments
View proposal: FT2025-1; Proposed implementation date: 19 May 2025: Status: DRAFT
The fast-track 2025-1 proposal for amendments includes the following:
FM 92 GRIB has new templates for reforecasts, verification scores, wave parameters, and random fields for stochastic parametrizations. It also has new code tables for radar data quality flags, hazard indices, stochastic parametrizations, and verification scores, as well as new parameters for oceanographic, meteorological, health and land surface disciplines.
FM 94 BUFR has a new template for cryospheric station temperature profiles, new codes in the type of temperature sensors and type of sea-surface height anomaly measurement code tables and a new flag table for OLCI classification and quality. It also has new descriptors in location (vertical), temperature, hydrographic and hydrological elements and radar data tables.
The Common Codes have new codes for the Scripps Institute of Oceanography centres, satellite identifiers, satellite instruments, and nuclide descriptions.
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These amendments are approved and will be published in 2025.
View all previous amendments.
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This manual includes
- Part B section b
- FM92-XIV GRIB
- FM94-XIV BUFR
- Part B section c
- WMO-CF Extensions
- Part C section c
- Common Code tables
- Part C section d
- Regulations for reporting traditional observation data in table-driven code forms (TDCF): BUFR or CREX
- Part C section e
- Regulations for reporting GBON parameters
- Part C, Attachment I
- Templates for the transmission in BUFR or CREX of other data types.
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Working Areas
The Expert Team on Data Standards (ET-Data) maintains the codes in GitHub repositories.
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Guidance
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Legacy Editions
Deprecated versions are available here for reference.
~ page update: 24-February-2025 ~