|Formation||23 March 1950|
|Type||United Nations specialised agency|
|United Nations Economic and Social Council|
|United Nations portal|
The World Meteorological Organization (WMO, in French Organisation Météorologique Mondiale or OMM) is an intergovernmental organization with a membership of 193 Member States and Territories. The President of the World Meteorological Congress, its supreme body, is Gerhard Adrian as a successor of David Grimes. The Organization is headquartered in Geneva, Switzerland.
It followed on from the International Meteorological Organization, founded in 1873, a non-governmental organization. Reforms of status and structure were proposed from the 1930s, culminating in the World Meteorological Convention signed on 11 October 1947 which came into force on 23 March 1950. It formally became the World Meteorological Organization on 17 March 1951, and was designated as a specialized agency of the United Nations.
WMO has a membership of 193 Member States and Territories as of May 2019. The Convention of the World Meteorological Organization was signed 11 October 1947 and established upon ratification on 23 March 1950.
The WMO hierarchy:
The annually published WMO Statements on the status of the World Climate provides details of global, regional and national temperatures and extreme weather events. It also provides information on long-term climate change indicators including atmospheric concentrations of greenhouse gases, sea level rise, and sea ice extent. The year 2016 was the hottest year on record, with many weather and climate extremes, according to the most recent WMO report.
In keeping with its mandate to promote the standardization of meteorological observations, the WMO maintains numerous code forms for the representation and exchange of meteorological, oceanographical, and hydrological data. The traditional code forms, such as SYNOP, CLIMAT and TEMP, are character-based and their coding is position-based. Newer WMO code forms are designed for portability, extensibility and universality. These are BUFR, CREX, and, for gridded geo-positioned data, GRIB.
As of May 2019, WMO Members include a total of 187 Member States and 6 Member Territories.
Ten United Nations member states are not members of WMO: Equatorial Guinea, Grenada, Liechtenstein, Marshall Islands, Nauru, Palau, Saint Kitts and Nevis, Saint Vincent and the Grenadines and San Marino. Cook Islands and Niue are WMO Members but non-members of the United Nations. Vatican City and State of Palestine and the states with limited recognition are not members of either organization.
The six WMO Member Territories are the British Caribbean Territories (joint meteorological organisation and membership),French Polynesia, Hong Kong, Macau, Curaçao and Sint Maarten (joint meteorological service and membership) and New Caledonia. (List of all members with admission dates.)
Region I consists of the states of Africa and a few former colonial powers. Region I has 57 member states and no member territories:
Region II has 33 member states and 2 member territories. The member states are:
The member territories are:
Region IV consists of the states of North America, Central America, and the Caribbean, including three European states with dependencies within the region. It has a total of 25 member states and 2 member territories. The member states are:
The two member territories are:
Region V consists of 21 member states and 2 member territories. The member states are:
The member territories are:
A total of ten member states have membership in more than one region. Two nations are members to four different regions, while eight are members of two regions. These nations, with their regions, are as follows:
Including country codes