Ashfall AdvisoryThis product is issued for a volcano undergoing a minor eruption where the public will be affected by a limited hazard extent, such as less than ¼ inch of ashfall accumulation. Ashfall may originate directly from a volcanic eruption or indirectly by wind suspending the ash.Ashfall WarningThis product is issued for a volcano undergoing a major eruption where the public will be affected to a significant extent, such as greater than or equal to ¼ inch of ashfall accumulation, significant debris, lava or lahar flows.
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