VAACSVeterans Administration Asymptomatic Carotid Study
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"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.
Airlines get up-to-date information about volcanic eruptions and ash plumes from a network of nine Volcanic Ash Advisory Centers (VAACs) in various countries, where government-funded scientists track the altitudes and positions of ash clouds just as air-traffic controllers keep tabs on all the jets in their areas.
Results of tests at his agency, which serves as part of the Washington, D.C., VAAC, suggest the new method works well for any ash plume in daylight and for those plumes moving over large bodies of water at night.