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Ash and Tephra Hazards from Mount Baker

Overall, Mount Baker has not produced large amounts of tephra fall in the past and probably will not in the future. The largest known tephra fall from Mount Baker (layer BA) was a little less than half the volume of the tephra fall from Mount St. Helens in 1980. The area of tephra-fall impact depends upon the direction or directions of the wind at altitude during eruption. Because winds are dominantly from the west, it is most likely that any tephra fall will be carried to the east away from most major communities; however, there is no guarantee that the wind will be from the west during the next eruption. From experience, we know that even minor amounts of tephra can damage machinery, cause power outages, disrupt everyday lives, and critically damage in-flight aircraft.