Alaska Volcano Observatory
ASH3D: Ash Cloud Height Forecast for Hypothetical Eruption
- This ash cloud height graphic is the output of a mathematical model of volcanic ash transport in the atmosphere (Ash3D, USGS).
- This model shows expected movement of an ash cloud in the atmosphere for actual or hypothetical eruptions.
- AVO produces this graphic when a volcano is restless by assuming a reasonable hypothetical eruption, in order to provide a pre-eruptive forecast of airspace likely to be affected. During an eruption, AVO updates the forecast with actual observations (eruption start time and duration, plume height) as they become available.
- Colors represent the height of the top of the ash cloud, in feet above sea level, as it drifts downwind.
- This graphic does not show ashfall deposition on the ground; go here for ashfall graphic. Note that it is possible for ash clouds to move overhead with little or no fallout on the ground.
- For more information about ASH3D, see USGS Open-File Report 2013-1122.
- Return to Great Sitkin activity page for more information on its eruptive status.
Page modified: November 27, 2017 11:43
Contact Information: AVO Web Team