1. Purpose. This instruction describes the World Area Forecast System (WAFS) and operational procedures and services provided by the Washington World Area Forecast Center (WAFC) in support of WAFS.
》这个文件介绍World Area Forecast System (WAFS)、操作流程以及Washington World Area Forecast Center(WAFC)支持WAFS所提供的服务。
2.  General.  The WAFS was established in 1982 by the International Civil Aviation Organization (ICAO) Communications/Meteorology (COM/MET) Divisional Meeting held conjointly with the seventh session of the World Meteorological Organization (WMO) Commission for Aeronautical Meteorology (CAeM) in Montreal.
》1982年，在蒙特利尔举行的第七届国际气象组织(WMO)航空气象委员会议之后，ICAO的COM/MET召开了部门会议，建立了WAFS。
The Federal Aviation Administration (FAA) is the meteorological authority, as defined by ICAO, for the United States and has agreed to provide a WAFC within the WAFS framework.
The FAA designated the National Weather Service (NWS) as the meteorological provider with responsibility for the WAFS broadcast.  The Washington WAFC became operational in 1996.
》FAA作为由ICAO所指定的美国气象主管部门，同意在WAFS系统框架内建立一个WAFC。FAA指定National Weather Service (NWS)负责气象信息的采集以及WAFS的传送。Washington WAFC在1996年开始运作。
3.  World Area Forecast System and World Area Forecast Centers.  The WAFS is defined in ICAO Annex 3, Meteorological Service for International Air Navigation, as “…a worldwide system by which world area forecast centers provide aeronautical meteorological en-route forecasts in uniform standardized formats.”  A WAFC is “…a meteorological center esignated to prepare and issue significant weather forecasts and upper-air forecasts in digital form on a global basis.”  The two ICAO-sponsored WAFCs are provided by the United States and United Kingdom and are referred to as the Washington WAFC and the London WAFC respectively.
》ICAO附件3(Meteorological Service for International Air Navigation)中WAFS定义为：“一个由区域预报中心提供的航路航空气象预报系统，使用全球统一的预报格式。”WAFC定义为：“负责向全球提供数字化重要天气预报以及高空天气预报的气象中心。”两个由ICAO发起成立的气象中心分别为美国的Washington WAFC和英国的London WAFC。
之后内容略。。。
详细内容可以参看源文件：10-806-world-area-forecast-system.pdf