Fig. 5From: An automated ash dispersion forecast system: case study Popocatépetl volcano, MexicoEruption 18:46 UTC, 20th May, 2016. Observed ash, red polygon according to the Washington-VAAC. Forecasted ash concentration, coloured area in mg/m3 (see legend). VAAC image taken from the VAAC-Washington webpageBack to article page