The ash plume of the Semeru volcano in Iceland.
Volcanic ash

London Volcanic Ash Advisory Centre (VAAC)

Hosted and run by the Met Office from its Exeter UK headquarters, the London VAAC has specialist forecasters who produce volcanic ash advisories and guidance products using a combination of volcano data; satellite-based, ground-based and aircraft observations; weather forecast models and dispersion models. The volcanic ash forecasts are provided to the standards and tolerances set by the regulator, and support decision-making by the CAA as the lead agency, NATS and airlines.

One of 9 VAACs worldwide, London VAAC provides a reciprocal back-up facility with Toulouse VAAC, operated by Meteo France.


Other Volcanic Ash Advisory Centres

Select an area to get more information about the 9 VAACs and their respective areas of responsibility

Map of the world showing VAAC areas

Additional resources

Additional NMS resources (password protected).

For more information about how we are using the NAME model and how to interpret the results, download our technical summary 'The current volcanic ash modelling set-up at the London VAAC'.