The definitions are here: http://www.wovo.org/aviation-colour-codes.html http://www.wovo.org/aviation-colour-codes.html Red means either "Eruption is forecast

The definitions are here: http://www.wovo.org/aviation-colour-codes.html http://www.wovo.org/aviation-colour-codes.html Red means either "Eruption is forecast to be imminent with significant emission of ash into the atmosphere likely." or, "Eruption is underway with significant emission of ash into the atmosphere." In this case, the latter.