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Volcanic Aviation Colour Code

Volcanic Aviation Colour Code ICAO Annex 15

NameDescription
RedEruption is forecasted to be imminent with significant emission of ash into the atmosphere likely. Or, eruption is underway with significant emission of ash into the atmosphere [specify ash-plume height if possible].
NilNil
Not GivenNot Given
UnknownUnknown
OrangeVolcano is exhibiting heightened unrest with increased likelihood of eruption. Or, volcanic eruption is underway with no or minor ash emission [specify ash-plume height if possible].
YellowEruption is forecasted to be imminent with significant emission of ash into the atmosphere likely. Or, eruption is underway with significant emission of ash into the atmosphere [specify ash-plume height if possible].
GreenVolcano is experiencing signs of elevated unrest above known background levels. Or, after a change from higher alert level: Volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.

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