Aviation | News | 2023-09-22 | WMO Circular letter issued on the discontinuation of WMO-No. 49, Volume II

News
22 September 2023

A Circular letter had been issued today, 22 September 2023, to Permanent Representatives of Members of WMO regarding the forthcoming discontinuation of the Technical Regulations (WMO-No. 49), Volume II, Meteorological Service for International Air Navigation. 

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Cover of a World Meteorological Organization document featuring an hourglass illustration and text about technical regulations for meteorological service for international air navigation.

A communications package on the discontinuation of WMO-No. 49, Volume II is available here. 

For further assistance, please contact the WMO Secretariat (aviationatwmo [dot] int (aviation[at]wmo[dot]int)).

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Last updated: 3 September 2026