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
 

28th of December 2020, 4 months ago

2020-12-28 02:17:00 UTC Orange

Bromo - 20201228/0217Z 

Wahyu Andrian Kusuma, Bromo Volcano Observatory - 4 months ago

Gas emission produced volcanic ash observed at Eruption with at 2250 UTC (0550 local). Best estimate of ash-cloud top is around 29875 FT (9053 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Gas emission with volcanic ash. Ashfall at Ngadirejo area, about 5 km northeast part from the crater..

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19th of July 2019, 1 year ago

2019-07-19 11:52:00 UTC Orange

Bromo - 20190719/1152Z 

Nia Haerani, Dr. S.T., M.T., Bromo Volcano Observatory - 1 year ago

Eruption with volcanic ash cloud at 0937 UTC (1637 local). Best estimate of ash-cloud top is around 0 FT (0 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. The height and direction of ash column couldnot observed due to weather obscured. .

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6th of April 2019, 2 years ago

2019-04-06 00:21:00 UTC Orange

Bromo - 20190406/0021Z 

Wahyu Andrian Kusuma, Bromo Volcano Observatory - 2 years ago

Eruption with volcanic ash cloud at 0018 UTC (0718 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 34099 FT (10333 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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27th of March 2019, 2 years ago

2019-03-27 10:43:00 UTC Orange

Bromo - 20190327/1043Z 

Rubiyo, Bromo Volcano Observatory - 2 years ago

Eruption with volcanic ash cloud at 1040 UTC (1740 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 40435 FT (12253 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north and northeast..

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2019-03-27 00:56:00 UTC Orange

Bromo - 20190327/0056Z 

Wahyu Andrian Kusuma, Bromo Volcano Observatory - 2 years ago

Eruption with volcanic ash cloud at 0100 UTC (0800 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 35155 FT (10653 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to west, northwest, north and northeast.

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26th of March 2019, 2 years ago

2019-03-26 09:50:00 UTC Orange

Bromo - 20190326/0950Z 

Rubiyo, Bromo Volcano Observatory - 2 years ago

Eruption with volcanic ash cloud at 0945 UTC (1645 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 37267 FT (11293 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to northeast and north.

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25th of March 2019, 2 years ago

2019-03-25 02:02:00 UTC Orange

Bromo - 20190325/0202Z 

Hadi Purwoko, A.Md.Kom., Bromo Volcano Observatory - 2 years ago

Eruption with volcanic ash cloud at 0200 UTC (0900 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 33043 FT (10013 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to Northeast.

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20th of March 2019, 2 years ago

2019-03-20 23:25:00 UTC Orange

Bromo - 20190320/2325Z 

Rubiyo, Bromo Volcano Observatory - 2 years ago

Eruption with volcanic ash cloud observed since 1100 UTC (0600 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 30931 FT (9373 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to eaat southeast..

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19th of March 2019, 2 years ago

2019-03-19 23:31:00 UTC Orange

Bromo - 20190319/2331Z 

Budi Marwanto, Bromo Volcano Observatory - 2 years ago

Eruption with volcanic ash cloud at 1100 UTC (0600 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 35155 FT (10653 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to east southeast..

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2019-03-19 07:04:00 UTC Orange

Bromo - 20190319/0704Z 

Wahyu Andrian Kusuma, Bromo Volcano Observatory - 2 years ago

Eruption with volcanic ash cloud at 0320 UTC (1020 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 40435 FT (12253 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Black Ash-cloud moving to east norteast.

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18th of March 2019, 2 years ago

2019-03-18 00:50:00 UTC Orange

Bromo - 20190318/0050Z 

Wahyu Andrian Kusuma, Bromo Volcano Observatory - 2 years ago

Eruption with volcanic ash cloud at 0036 UTC (0736 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 35155 FT (10653 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 nortwest.

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17th of March 2019, 2 years ago

2019-03-17 23:37:00 UTC Orange

Bromo - 20190317/2337Z 

Wahyu Andrian Kusuma, Bromo Volcano Observatory - 2 years ago

Eruption with volcanic ash cloud observed since 1030 UTC (0530 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 37267 FT (11293 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Ash-cloud moving to north, northeast.

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2019-03-17 05:09:00 UTC Orange

Bromo - 20190317/0509Z 

Wahyu Andrian Kusuma, Bromo Volcano Observatory - 2 years ago

Eruption with volcanic ash cloud at 0502 UTC (1202 local). Eruption and ash emission is continuing Best estimate of ash-cloud top is around 37267 FT (11293 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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2019-03-17 00:22:00 UTC Orange

Bromo - 20190317/0022Z 

Budi Marwanto, Bromo Volcano Observatory - 2 years ago

Eruption with volcanic ash cloud observed since 1300 UTC (0600 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 35155 FT (10653 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Grey and brown Ash-cloud moving to north, northeast and east..

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16th of March 2019, 2 years ago

2019-03-16 00:43:00 UTC Orange

Bromo - 20190316/0043Z 

Budi Marwanto, Bromo Volcano Observatory - 2 years ago

Eruption with volcanic ash cloud observed since 1300 UTC (0600 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 31987 FT (9693 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Grey and brown Ash-cloud moving to north, northeast and east..

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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.