Manual on Codes, Volume I.1 – International Codes
Annex II to the WMO Technical Regulations
Part A – Alphanumeric Codes
Volume I contains WMO international codes for meteorological data and other geophysical data relating to meteorology
it constitutes Annex II of the WMO Technical Regulations and, therefore, has the status of a Technical Regulation. It is issued in two volumes: Volume I.1, containing Part A, and Volume I.2, containing Part B and Part C.