VONA stands for Volcano Observatory Notice for Aviation. It issues reports for changes, both increases and decreases, in volcanic activities, providing a description on the nature of the unrest or eruption, potential or current hazards as well as likely outcomes. See the following link (USGS) for further details. The Center for Volcanology and Geological Hazard Mitigation (CVGHM) under the Geological Agency of the Indonesian Ministry of Energy and Mineral Resources produced VONA's reports based on analysis of data from the agency's monitoring networks as well as from direct observations. VONA's alert levels are color-coded to indicate the different types of notifications addressing specific informative needs. The reports are disseminated via email to national and international stakeholders in the aviation sector. Other interested parties can avail of them through email subscription. All notifications are publicly available online.
USGSToday
Eruption with volcanic ash cloud at 0419 UTC (1119 local) Best estimate of ash-cloud top is around 14272 FT (4460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to E.
View4th of May 2021, 2 days ago
Eruption with volcanic ash cloud at 0023 UTC (0723 local). Best estimate of ash-cloud top is around 13683 FT (4276 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to north.
View3rd of May 2021, 3 days ago
Eruption with volcanic ash cloud at 2120 UTC (0620 local). Best estimate of ash-cloud top is around 5853 FT (1829 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to southwest.
View2nd of May 2021, 4 days ago
Ili Lewotolok - 20210502/0902Z
Eruption with volcanic ash cloud at 0827 UTC (1627 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 6154 FT (1923 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.
View1st of May 2021, 5 days ago
Eruption with volcanic ash cloud at 2337 UTC (0837 local). Best estimate of ash-cloud top is around 5533 FT (1729 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.
View30th of April 2021, 6 days ago
Eruption with volcanic ash cloud at 0220 UTC (0920 local) Best estimate of ash-cloud top is around 10112 FT (3160 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to W.
View28th of April 2021, 1 week ago
Eruption with volcanic ash cloud at 2250 UTC (0550 local) Best estimate of ash-cloud top is around 13043 FT (4076 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to south.
ViewEruption with volcanic ash cloud at 1646 UTC (2346 local) Best estimate of ash-cloud top is around 12672 FT (3960 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to W - WS..
ViewEruption with volcanic ash cloud at 1110 UTC (1810 local) Best estimate of ash-cloud top is around 11072 FT (3460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to S - SE..
ViewEruption with volcanic ash cloud at 0728 UTC (1428 local) Best estimate of ash-cloud top is around 11072 FT (3460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to S-SW..
ViewEruption with volcanic ash cloud at 0040 UTC (0740 local). Best estimate of ash-cloud top is around 13683 FT (4276 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to southwest.
View27th of April 2021, 1 week ago
Eruption with volcanic ash cloud at 0323 UTC (1023 local) Best estimate of ash-cloud top is around 11072 FT (3460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to E-SE. .
ViewEruption with volcanic ash cloud at 0112 UTC (0812 local) Best estimate of ash-cloud top is around 11072 FT (3460 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to S-SW. .
View26th of April 2021, 1 week ago
Eruption with volcanic ash-cloud at 0016 UTC (0916 local) Best estimate of ash-cloud top is around 6160 FT (1925 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Grey ash-cloud moving to north.
View25th of April 2021, 1 week ago
Volcano is in normal, non-eruptive state, or, after a change from a higher level: Volcanic activity considered to have ceased, and volcano reverted to its normal, non-eruptive state.
Volcano is experiencing signs of elevated unrest above known background levels, or, after a change from higher level: Volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
Volcano is exhibiting heightened unrest with increased likelihood of eruption with column height below 6000 meter above sea level.
Eruption is forecast to be imminent with significant emission of ash with column height above 6000 meter above sea level.
