VONA
What is VONA?

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.

USGS
 

27th of July 2021, 1 week ago

2021-07-27 23:47:00 UTC Orange

Ili Lewotolok - 20210727/2347Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 1 week ago

Eruption with volcanic ash cloud at 2322 UTC (0722 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 7114 FT (2223 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to West.

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2021-07-27 16:46:00 UTC Orange

Ili Lewotolok - 20210727/1646Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 1 week ago

Eruption with volcanic ash cloud at 1624 UTC (0024 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 7754 FT (2423 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to West.

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14th of July 2021, 3 weeks ago

2021-07-14 22:25:00 UTC Orange

Ili Lewotolok - 20210714/2225Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 2 weeks ago

Eruption with volcanic ash cloud at 2218 UTC (0618 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 7114 FT (2223 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to Northwest.

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13th of July 2021, 3 weeks ago

2021-07-13 02:08:00 UTC Orange

Ili Lewotolok - 20210713/0208Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 0206 UTC (1006 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 7114 FT (2223 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to Northwest.

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7th of July 2021, 4 weeks ago

2021-07-07 02:51:00 UTC Orange

Ili Lewotolok - 20210707/0251Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 3 weeks ago

Eruption with volcanic ash cloud at 0252 UTC (1052 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 7114 FT (2223 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to Northwest.

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6th of July 2021, 4 weeks ago

2021-07-06 23:20:00 UTC Orange

Ili Lewotolok - 20210706/2320Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 4 weeks ago

Eruption with volcanic ash cloud at 2257 UTC (0657 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 8074 FT (2523 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to east.

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5th of July 2021, 4 weeks ago

2021-07-05 22:55:00 UTC Orange

Ili Lewotolok - 20210705/2255Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 4 weeks ago

Eruption with volcanic ash cloud at 2252 UTC (0652 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 7114 FT (2223 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to Northwest.

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2021-07-05 01:26:00 UTC Orange

Ili Lewotolok - 20210705/0126Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 4 weeks ago

Eruption with volcanic ash cloud at 0036 UTC (0836 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 7754 FT (2423 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to southeast.

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21st of June 2021, 1 month ago

2021-06-21 14:35:00 UTC Orange

Ili Lewotolok - 20210621/1435Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 1426 UTC (2226 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 11507 FT (3596 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.

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16th of June 2021, 1 month ago

2021-06-16 04:29:00 UTC Orange

Ili Lewotolok - 20210616/0429Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 0423 UTC (1223 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 7754 FT (2423 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.

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15th of June 2021, 1 month ago

2021-06-15 00:41:00 UTC Orange

Ili Lewotolok - 20210615/0041Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 2346 UTC (0746 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 7754 FT (2423 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.

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14th of June 2021, 1 month ago

2021-06-14 02:32:00 UTC Orange

Ili Lewotolok - 20210614/0232Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 0214 UTC (1014 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 6474 FT (2023 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.

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13th of June 2021, 1 month ago

2021-06-13 23:37:00 UTC Orange

Ili Lewotolok - 20210613/2337Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 1134 UTC (0734 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 11667 FT (3646 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west and northwest.

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2021-06-13 21:27:00 UTC Orange

Ili Lewotolok - 20210613/2127Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 2122 UTC (0522 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 16061 FT (5019 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.

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2021-06-13 01:01:00 UTC Orange

Ili Lewotolok - 20210613/0101Z 

Stanislaus Ara Kian, A.Md., Ili Lewotolok Volcano Observatory - 1 month ago

Eruption with volcanic ash cloud at 0156 UTC (0856 local). Eruption and ash emission is not continuing. Best estimate of ash-cloud top is around 6794 FT (2123 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west.

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VONA Color Code

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.