Volume I.1
Manual on Codes (WMO-No. 306), Volume I.1 - Part A - Alphanumeric Codes
Annex II to the WMO Technical Regulations
Per Resolution 12 (EC-69), this publication "..shall remain unchanged until such time as the traditional alphanumeric codes are no longer supported for operational exchange by World Weather Watch, but that if any provision for information exchange that is expressed as an obligation in that volume should change, that provision should be transferred to the Technical Regulations from which the obligation is derived".
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Manual on Codes (WMO-No. 306), Volume I.1 - part A- Alphanumeric Codes [2019 edition]
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~ page update: 24-February-2025 ~