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 0038 UTC (0738 local). Best estimate of ash-cloud top is around 15603 FT (4876 M) above sea level or 3840 FT (1200 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to southeast. Volcanic ash is observed to be gray to brown. The intensity of volcanic ash is observed to be thick..
ViewEruption with volcanic ash cloud at 0005 UTC (0705 local). Best estimate of ash-cloud top is around 14003 FT (4376 M) above sea level or 2240 FT (700 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving from southeast to south. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
View24th of March 2023, 1 day ago
Eruption with volcanic ash cloud at 2300 UTC (0600 local). Best estimate of ash-cloud top is around 13363 FT (4176 M) above sea level or 1600 FT (500 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving from south to southwest. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick..
ViewIli Lewotolok - 20230324/0944Z
Eruption with volcanic ash cloud at 0944 UTC (1744 local). Best estimate of ash-cloud top is around 6794 FT (2123 M) above sea level or 2240 FT (700 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to northwest. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
View23rd of March 2023, 2 days ago
Eruption with volcanic ash cloud at 2248 UTC (0548 local). Best estimate of ash-cloud top is around 14963 FT (4676 M) above sea level or 3200 FT (1000 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to south. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick..
ViewEruption with volcanic ash cloud at 0110 UTC (0810 local). Best estimate of ash-cloud top is around 14323 FT (4476 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 northwest. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick..
View22nd of March 2023, 3 days ago
Eruption with volcanic ash cloud at 2350 UTC (0650 local). Best estimate of ash-cloud top is around 14323 FT (4476 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 thick..
ViewIli Lewotolok - 20230322/1216Z
Eruption with volcanic ash cloud at 1216 UTC (2016 local). Best estimate of ash-cloud top is around 6154 FT (1923 M) above sea level or 1600 FT (500 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to west. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick..
ViewIli Lewotolok - 20230322/0823Z
Eruption with volcanic ash cloud at 0823 UTC (1623 local). Best estimate of ash-cloud top is around 6154 FT (1923 M) above sea level or 1600 FT (500 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to west. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick..
View21st of March 2023, 4 days ago
Ili Lewotolok - 20230321/2117Z
Eruption with volcanic ash cloud at 2117 UTC (0517 local). Best estimate of ash-cloud top is around 5834 FT (1823 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 northwest. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
ViewIli Lewotolok - 20230321/0856Z
Eruption with volcanic ash cloud at 0856 UTC (1656 local). Best estimate of ash-cloud top is around 5834 FT (1823 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 northwest. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick..
ViewEruption with volcanic ash cloud at 0659 UTC (1359 local). Best estimate of ash-cloud top is around 14323 FT (4476 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 south to southwest. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick..
ViewEruption with volcanic ash cloud at 0401 UTC (1101 local). Best estimate of ash-cloud top is around 13043 FT (4076 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 from southwest to west. Volcanic ash is observed to be gray to brown. The intensity of volcanic ash is observed from medium to thick..
View20th of March 2023, 5 days ago
Eruption with volcanic ash cloud at 0111 UTC (0811 local). Best estimate of ash-cloud top is around 14963 FT (4676 M) above sea level or 3200 FT (1000 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 to brown. The intensity of volcanic ash is observed to be thick..
ViewEruption with volcanic ash cloud at 0013 UTC (0713 local). Best estimate of ash-cloud top is around 13683 FT (4276 M) above sea level or 1920 FT (600 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 white to gray. The intensity of volcanic ash is observed to be thick..
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.
