From professional links to an intergovernmental convention
The World Meteorological Organization (WMO) inherited the International Meteorological Organization's (IMO) cross-border cooperation. Weather systems crossed national boundaries, and aviation, shipping and agriculture needed observations from different places to connect. National services had to exchange information and agree on how to observe, encode and publish results. Postwar reorganization placed longstanding professional links under an intergovernmental convention.
The WMO Convention was signed in Washington on 11 October 1947. Countries including the United States, United Kingdom, France, Australia and India subsequently ratified or acceded. Under Article 35, it entered into force on the thirtieth day after deposit of the thirtieth relevant instrument, 23 March 1950. This is the organization's legal establishment date, distinct from the first Congress and formal organization of working bodies the following year.
The Paris Congress establishes working bodies
The First World Meteorological Congress met in Paris from 19 March to 28 April 1951. It arranged dissolution and succession of the former organization's working bodies, adopted general, financial and staff regulations, established an Executive Committee, six regional associations and eight technical commissions, and selected Geneva as headquarters. Regional associations addressed shared regional problems, technical commissions studied specialized standards, and Congress determined overall policy.
Francis Reichelderfer, head of the U.S. Weather Bureau, was elected President, and former IMO Secretariat head Gustav Swoboda became Secretary-General. Congress approved the relationship agreement with the United Nations in April; it entered into force following UN General Assembly approval on 20 December, bringing WMO into the specialized-agency system. The agreement concerned mutual representation, information exchange and coordination, not abolition of national meteorological services.
How members' contributions sustained the Secretariat
The new organization operated with a definite budget, rather than appeals at meetings alone. The Executive Committee provided $190,000 for expenditure from 4 April to 31 December 1951 and decided to request a $20,000 UN loan pending receipt of members' payments. New members increased the year's assessed contributions to $195,249, but only nearly half had been received by year-end, revealing the gap between a budget on paper and actual cash receipts.
The 1952 budget was $272,379, funded mainly by members' contributions and also publication sales and other income. On 10 December 1951, the Secretariat moved from Lausanne to temporary premises in Geneva. By the end of 1952, 31 established posts were filled, with technical, technical-assistance and external-relations units in place. Financial and staffing arrangements enabled ongoing international coordination without ad hoc reorganization each time.
Negotiating shared observations detail by detail
Article 2 assigned tasks including establishment of observation networks, rapid exchange of weather information, and standardization of observations and statistical publication, linking these to aviation, shipping, agriculture, research and training. Headquarters did not thereby take over every observing station. Early data networks and research remained chiefly national responsibilities, while the Secretariat organized meetings, prepared publications and promoted shared rules.
Common rules required compromise. Paul Edwards notes that some countries traditionally observed at two-hour intervals while others favored three-hour intervals. In 1953, the technical commission for synoptic meteorology debated whether regulations should use mandatory “shall” or advisory “should.” Congress distinguished standard and recommended practices in 1955. Cooperation therefore did not follow automatically from signing a convention; instruments, schedules and administrative habits had to be joined detail by detail.
Bringing new meteorological services into the network
Technical assistance was another practical early activity. The 1951 Congress considered Libya's approaching independence: its meteorological operations depended on foreign personnel, and political transition could interrupt service. It asked the Executive Committee to examine continuity arrangements and assist within available resources. Organizational cooperation thus extended from exchanging existing data to sustaining the institutions and people producing them.
Launched in 1952, the WMO Bulletin described technical commissions, regional associations and assistance programmes, giving members a channel to understand common work. WMO's formation connected government commitments, member funding, technical standards and training. Later growth in global observing cooperation rested on these institutions and daily activities, rather than an already complete global automated network existing in 1950.