WORLD WEATHER WATCH

program established in 196162 by the World Meteorological Organization to improve the global system for meteorological observation and prediction. It is designed to avoid duplication in preparing analyses and prognoses, while still providing each meteorological service with the data and background information it requires to carry out its responsibilities. The system is based on the establishment of world and regional centres at strategic locations around the globe. A selected, representative sample of various sources of global conventional and satellite meteorological observations, enough to establish the broad picture of the world weather situation, is transmitted to world centres where world and hemispheric analyses are prepared both for climatological and research uses and for transmission to the various research centres. The latter select from the daily output of world observations the data required for preparing regional analyses and prognoses for the benefit of countries within the region.