in development

~ August/September 2025

Manual on the WMO Information System (WMO-No. 1060), Volume II

[2023 edition, updated in 2024]

FT2024-2 amendments to be published. It includes revisions to WNM and WTH

Guide to WMO Information System (WMO-No. 1061), Volume II

[2024 edition]

Provisions for the transition from WIS 1.0 and GTS to WIS 2.0 (WMO-No. 1323) 

[2024 edition]

Manual on Codes (WMO-No. 306), Volume I.2 

[2023 edition]

Part B – Binary Codes, Part C – Common Features to Binary and Alphanumeric Codes

FT2023-2 , FT2024-1,  FT2024-2 to be published. They include revisions to GRIB, BUFR, and CCT.

Latest Machine Codes

Volume I.2 (about page) 

View all previous amendments

Manual on Codes (WMO-No. 306), Volume I.3 [2023 edition]

Part D – Representations derived from data models

Annex II to the WMO Technical Regulations

Manual on the WMO Information System (WMO-No. 1060), Volume I

Annex VII to the WMO Technical Regulations

Manual on the Global Telecommunication System (WMO-No. 386) [2023 edition]

Annex III to the WMO Technical Regulations

Note: Per Resolution 16 (EC-78), "the Manual on the Global Telecommunication System (WMO-No. 386) will no longer be updated from 31 December 2024;"

Manual on Codes (WMO-No. 306), Volume I.1

part A- Alphanumeric Codes

Annex II to the WMO Technical Regulations

note: Per Resolution 12 (EC-69), "the status of the Manual on Codes, Volume I.1 shall remain unchanged until such time as the traditional alphanumeric codes are no longer supported for operational exchange by World Weather Watch..."