Not Given Not Given NOT GIVEN Unknown Unknown UNKNOWN Volcano 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. Yellow YELLOW 2016-12-30T13:26:16.18Z Eruption 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]. Red RED Nil Nil NIL Volcano 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]. Orange ORANGE Volcanic Aviation Colour Code ICAO Annex 15 1 Volcano is in normal, non-eruptive state. Or, after a change from a higher alert level: Volcanic activity considered to have ceased, and volcano reverted to its normal, non-eruptive state. Green GREEN Volcanic Aviation Colour Code