Variable domain 0-120 hr outlook ash concentration graphics
Modelled volcanic ash concentration forecasts are available below. Volcanic Ash Forecasts are only available from London VAAC for volcanoes erupting within the London VAAC area.
These charts supplement the London Volcanic Ash Advisory graphics (VAG) and advisories (VAA). They are to be used with caution. The outer edge of the low concentration zones (indicated as cyan) on these charts represent the standard threshold (200 micrograms of ash per cubic meter) as used