Main meteorological office

From Glossary of Meteorology

main meteorological office

(Abbreviated MMO.) An office that provides meteorological service for international air navigation in accordance with International Civil Aviation Organization specifications.

MMOs 1) prepare forecasts; 2) supply meteorological information and briefings to aeronautical personnel; 3) supply meteorological information required by an associated dependent meteorological office or supplementary meteorological office.
See also meteorological watch office.