The Redoubt Volcano in Alaska began a series of eruptions on 14 December 1989. Volcanic ash was often reported to reach heights where, as it moved with the upper-level flow, it could affect aircraft operations thousands of km from the eruption. The NOAA Air Resources Laboratory (ARL) was assigned responsibility for providing long-range forecast trajectories of volcanic ash during a volcanic hazards alert. An ARL immediate-response program was implemented for the Redoubt Volcano eruptions. The response products, in the form of tables, maps, and written messages are discussed. An evaluation of the forecast trajectories is included. -from Authors
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Heffter, J. L., Stunder, B. J. B., & Rolph, G. D. (1990). Long-range forecast trajectories of volcanic ash from Redoubt Volcano eruptions. Bulletin - American Meteorological Society, 71(12), 1731–1738.