The London VAAC is an International Civil Aviation Organization (ICAO) designated centre, responsible for issuing advisories for volcanic eruptions originating in Iceland and the north-eastern corner of the North Atlantic.
On Tuesday 24 May London VAAC will occasionally be issuing exercise Volcanic Ash products (including ash concentration charts). The products will appear on these, and linked, pages and will be clearly marked as TEST or EXERCISE. Please do not take any action on these products. In the event of a real eruption this message will be removed and all issued products will appear without the TEST or EXERCISE header.
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.
Map of the 9 VAACs and their respective areas of responsibility
Last updated: 20 May 2016
Leaflet on the use of NAME to model Volcanic Ash
Technical summary, 2012