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.
USGS27th of August 2025, 1 day ago
Eruption at 2118 UTC (0418 local). Ash-cloud is not observed. Ash-cloud is not observed..
ViewEruption with volcanic ash cloud at 1412 UTC (2312 local). Best estimate of ash-cloud top is around 5200 FT (1625 M) above sea level or 960 FT (300 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
ViewLewotobi Laki-laki - 20250827/1246Z
Eruption with volcanic ash cloud at 1246 UTC (2046 local). Best estimate of ash-cloud top is around 7629 FT (2384 M) above sea level or 2560 FT (800 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to southwest. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be medium..
ViewEruption at 1250 UTC (1950 local). Ash-cloud is not observed. Ash-cloud is not observed..
ViewEruption with volcanic ash cloud at 1226 UTC (2126 local). Best estimate of ash-cloud top is around 5200 FT (1625 M) above sea level or 960 FT (300 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
ViewLewotobi Laki-laki - 20250827/0956Z
Eruption with volcanic ash cloud at 0956 UTC (1756 local). Best estimate of ash-cloud top is around 7629 FT (2384 M) above sea level or 2560 FT (800 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving from southwest to west. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
ViewEruption at 0847 UTC (1547 local). Ash-cloud is not observed. Ash-cloud is not observed..
ViewEruption with volcanic ash cloud at 0845 UTC (1745 local). Best estimate of ash-cloud top is around 5520 FT (1725 M) above sea level or 1280 FT (400 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
ViewEruption at 0658 UTC (1358 local). Ash-cloud is not observed. Ash-cloud is not observed..
ViewEruption at 0156 UTC (0856 local). Ash-cloud is not observed. Ash-cloud is not observed..
View26th of August 2025, 2 days ago
Eruption at 2257 UTC (0757 local). Ash-cloud is not observed. Ash-cloud is not observed..
ViewEruption with volcanic ash cloud at 2058 UTC (0358 local). Best estimate of ash-cloud top is around 12723 FT (3976 M) above sea level or 960 FT (300 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to southwest. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick..
ViewEruption at 1643 UTC (2343 local). Ash-cloud is not observed. Ash-cloud is not observed..
ViewEruption at 1358 UTC (2058 local). Ash-cloud is not observed. Ash-cloud is not observed..
ViewVolcano 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.
