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一、引言世界区域预报系统（WAFS）隶属于国际民航组织，其目的是用图形和数字形式为航空气象部门及其他用户提供航线气象条件的预报。该系统有两个预报中心，分别设在伦敦和华盛顿，其产品通过卫星向世界各地广播。民航北京和广州气象中心接收并应用＊＊陀（伦敦）的产品，以
I. INTRODUCTION WAFS is part of ICAO and is designed to provide aeronautical meteorological services and other users with weather and meteorological forecasts in graphical and numerical formats. The system has two forecasting centers in London and Washington, respectively, and their products are broadcasted worldwide by satellite. Civil Aviation Beijing and Guangzhou Meteorological Center to receive and apply ** Tuo (London) products