All flights should always avoid volcanic ash. I don't know exactly what the colour scale means (probably higher particle density or altitude or extent), but any

All flights should always avoid volcanic ash. I don't know exactly what the colour scale means (probably higher particle density or altitude or extent), but any aircraft would be advised to avoid the plume. In this case, it is not currently interfering with usual flight paths, but the bulletin indicates that the wind direction is expected to change, so I would say it means be advised and monitor the situation.