About the Manual on Codes, Volume I.3

Manual on Codes (WMO-No. 306), Volume I.3 - Part D

Annex II to the WMO Technical Regulations

Representations derived from data models consist of the specification of the list of standard representations derived from data models, including those using extensible markup language (XML), with their specifications and associated code tables. 

Amendments

Links to proposals for amendments will be available here until a new version of the Manual or the codes are republished.

View proposals

• FT2026-2 for WIGOS Codes: FINAL DRAFT
• FT2025-2 for IWXXM: APPROVED

View archive of all amendments since 2009. 

This manual includes

• FM 205: IWXXM --> Read more about IWXXM
• FM 241: WMDR