Predicted Ash Cloud :: Composite of Airborne Ash (4 to 8 km altitude) Stromboli Volcano First 6 hrs First 12 hrs First 18 hrs First 24 hrs Predicted Ash Cloud :: Composite of Airborne Ash Concentrations (4 to 8 km altitude) Stromboli Volcano First 6 hrs First 12 hrs First 18 hrs First 24 hrs Back to main for Stromboli Volcano Other Composites Composites below 4km Composites 4 to 8 km altitude Composites 8 to 12 km altitude Composites 12 to 16 km altitude Composites FL200 to FL300 Composites below FL200 Composites above FL200 Composites below FL300 Composites above FL300