火山灰咨询中心（VAAC）由地区空中航行协议指定的气象中心，负责向气象监视台、区域管制中心、飞行情报中心、世界区域预报中心和国际飞行气象情报数据库提供有关火山喷发后大气中火山灰在横向和纵向上的分布及预报移动方面的信息。
蒙特利尔的火山灰咨询中心通过卫星并未观测到任何火山灰会飘到领空的迹象。
The Volcanic Ash Advisory Center in Montreal has not seen any signs of ash in its airspace via satellite, Hall says.
这些观测有助于火山灰咨询中心的模式研究者们改进预报模型，向飞行员和其他航空爱好者发布更准确的警报。
These observations help modelers in volcanic ash advisory centers improve forecasting models and issue more accurate warnings to pilots and others with aviation interests.
这次研讨会中证明的是，国家火山灰咨询中心所给出的意见在大多数情况下已经非常非常准确；而这已被飞机测量值所证实。
What was demonstrated during this workshop was that the advice that has been given out by the VAACs has been very, very accurate in most cases; and this has been confirmed by aircraft measurements.
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