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What does DVA stand for?

DVA stands for Dispersion of Volcanic Ash

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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.
Volcanic ash is a hazard to aircraft because it can degrade engine performance and navigational and operational instrumentation. Operationally, the NWS runs the ARL-developed HYSPLIT model to forecast the transport and dispersion of volcanic ash in and near the U. S. Volcanic Ash Advisory Centers'(VAAC) (Anchorage, AK, and Washington, DC) areas of responsibility.