Volume A contained a complete list of all the surface and upper-air stations in operation, which are used for synoptic purposes.  The contents are arranged in the order of the WMO Regions and in index number order within each Region.  The regional sections are followed by sections containing stations in the Antarctic and Ocean Weather Stations.

The Volume A modification to accommodate station coordinates with higher precision was developed following the recommendation of CBS-EXT. (06) and approval of EC-LIX. The Secretariat released a Letter of notification of the revised changes to Members with a request for updated information of their stations in accordance to the new specifications.

• Record layout of data flatfiles (Revised)
• Code tables of data flatfiles
• Feedback Form (condensed version) / (complete version)
• Explanation in completing the Feedback Form
• WMO Station IDs
• Flatfile of data on Observing Stations (historical version as of 15 April 2016)

Note:
In order to maintain and improve the accuracy of information contained in Volume A, Members were kindly requested to advise the Secretariat of any amendments by completing the appropriate Feedback Form

Contact: wmo@wmo.int

WMO Catalogue of Radiosondes and Upper-air wind Systems

In addition to the information included in Volume A for upper-air stations, the catalogue provided information on the type of radiosonde, windfinding equipment, ground systems, radiation corrections applied to temperature observations and other local practices for the radiosondes and upper-air systems in use by Members.

(Summary retrieved from srrarasasa group of section 7 (31313) in TEMP messages and a4 code figures in TEMP and PILOT messages over GTS)

• Excel file / .xls format (hisorical version as of July 2014)

Further references:

• ECMWF upper-air geopotential monitoring statistics and other related information

Older edition of the Catalogue:

• Excel file / .xls format (July 2007 historical edition)