climatology and meteorology

World Weather Watch

the world-wide, coordinated system of meteorological facilities and services provided by World Meteorological Organization members for the purpose of ensuring that all members obtain the meteorological information required both for operational work and for research; the essential elements of the WWW are: the global observing system, the global data-processing system, and the global telecommunication system.

World Meteorological Organization Program

any scientific project (field experiment, inter-comparison, etc.) internationally performed under the aegis of the World Meteorological Organization.

World Meteorological Organization

created by the World Meteorological Convention and recognized as a special agency of the United Nations in 1951; the WMO consists of more than 185 member countries; and facilitates international cooperation in all aspects of meteorology.


the state of the atmosphere, mainly with respect to its effects upon life and human activities; distinguished from climate by focusing on short-term (minutes to about 15 days) variations of the atmosphere state.

water vapor

water substance in vapor (gaseous) form; one of the most important of all constituents of the atmosphere.

water sky

the dark appearance of the underside of a cloud layer when it is over a surface of open water; it is darker than land sky, and much darker than ice blink or snow blink.

warm front

the forward edge of an advancing warm air mass that is displacing cooler air in its path.


the greatest distance that prominent objects can be seen and identified by unaided, normal eyes.

upper atmosphere

the general term applied to the atmosphere above the mesopause.

upper air observation

an observation made in the free atmosphere either directly or indirectly.


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