Overall Green Volcanic eruption for Merapi
in Indonesia

Volcano Ash Advisories for air traffic

Although Volcano Ash Advisories (VAAC) are not intended for assessing humanitarian impact, the observations of the plume are relevant for understanding local impact. The actual impact (like ash fall) depends on the type of eruption and is not known.

Click on the messages list to visualize on the right the detailed text.



30/11 00:00

Volcanic Ash Advisory issued on 2021-01-28 at 00:40 UTC.

    Key information extracted from original VAA message :


    Aviation Colour Code :  


  • Localised volcanic ash emission to flight level 120 (3600m).
  • Volcano and surrounding area obscured by meteorological cloud. Volcanic ash has not been observed for over 15 hours, and no other sources indicate the presence of volcanic ash. Local minor volcanic ash emissions are possible with continuing pyroclastic ow advisory terminated.

Original Message :

Volcanic Ash Advisory issued on 2021-01-27 at 18:40 UTC.

    Key information extracted from original VAA message :


    Aviation Colour Code :  


  • Localised volcanic ash emission to flight level 120 (3600m).
  • Volcanic ash currently not identifiable on satellite imagery due to meteorological cloud. Webcam imagery indicates volcanic ash emission just above the volcano summit. Pyroclastic ow continuing. Volcanic ash height and movement based on model guidance.

Original Message :

Volcanic Ash Advisory issued on 2021-01-27 at 12:40 UTC.

    Key information extracted from original VAA message :


    Aviation Colour Code :  


  • Localised volcanic ash emission to flight level 120 (3600m).
  • Current satellite imagery and multiple pireps indicate that volcanic ash to flight level 400 (12000m) has now dissipated. Localised volcanic ash emission to flight level 120 (3600m) expected due to superheated pyroclastic ow, however obscured by meteorological cloud.

Original Message :

Volcanic Ash Advisory issued on 2021-01-27 at 09:40 UTC.

    Key information extracted from original VAA message :


    Aviation Colour Code :  


  • Volcanic ash to flight level 400 (12000m) at 27 0720 UTC move nw.
  • Volcanic ash to flight level 400 (12000m) observation at 27/0630z, move nnw. Multiple ground reports of significant eruption. Localised volcanic ash emission to flight level 200 (6000m) due to superheated pyroclastic ow expected to move ne, however obscured by meteorological cloud. Volcanic ash to flight level 400 (12000m) expected to dissipate.

Original Message :

Volcanic Ash Advisory issued on 2021-01-27 at 08:40 UTC.

    Key information extracted from original VAA message :


    Aviation Colour Code :  


  • Volcanic ash to flight level 400 (12000m) at 27 0720 UTC move nw.
  • Volcanic ash to flight level 400 (12000m) observation at 27/0630z, move nnw. Multiple ground reports of significant eruption. Localised volcanic ash emission to flight level 200 (6000m) due to superheated pyroclastic ow expected to move ne, however obscured by meteorological cloud. Volcanic ash to flight level 400 (12000m) expected to dissipate.

Original Message :

Volcanic Ash Advisory issued on 2021-01-27 at 07:40 UTC.

    Key information extracted from original VAA message :


    Aviation Colour Code :  


  • Volcanic ash to flight level 400 (12000m) at 27 0720 UTC move nw.
  • Volcanic ash to flight level 400 (12000m) based on infrared temperature of -50c at 27/0630z, move nnw. Multiple ground reports of significant eruption. Volcanic ash blw flight level 240 (7200m) expected to move north east at 20kt, however obscured by meteorological cloud.

Original Message :

Volcanic Ash Advisory issued on 2021-01-27 at 07:20 UTC.

    Key information extracted from original VAA message :


    Aviation Colour Code :  


  • Volcanic ash to flight level 400 (12000m) at 27 0700 UTC.
  • Volcanic ash to flight level 400 (12000m) based on infrared temperature of -50c at 27/0630z. Multiple ground reports of significant eruption. Meteorological cloud in area obscures volcanic ash blw 240, which is expected to travel to north east at 20kt.

Original Message :

Volcanic Ash Advisory issued on 2021-01-27 at 07:00 UTC.

    Key information extracted from original VAA message :


    Aviation Colour Code :  


  • Volcanic ash to flight level 400 (12000m) at 27 0640 UTC.
  • Significant eruption underway, awaiting further confirmation from ground observers. Follow up details to be provided as soon as possible.

Original Message :

Volcanic Ash Advisory issued on 2021-01-26 at 23:00 UTC.

    Key information extracted from original VAA message :


    Aviation Colour Code :  


  • Local volcanic ash emission to flight level 100 (3000m) at 26 2251 UTC.
  • Volcanic ash emission observation to summit height due to continuing lava ows, remaining near summit. Volcanic ash not identifiable on satellite img due to meteorological cloud. Advisory will be updated if further information is received.

Original Message :

Volcanic Ash Advisory issued on 2021-01-20 at 10:17 UTC.

    Key information extracted from original VAA message :


    Aviation Colour Code :  


  • Volcanic ash to approximately flight level 100 (3000m) at 20 1000 UTC.
  • Ash and smoke discernible on webcam owing downstream of volcano and localised around the summit. Pyroclastic ow continues to slide from the summit. Volcanic ash was not discernible on satellite img due to meteorological cloud. Advisory will be updated if new information is received.

Original Message :

Volcanic Ash Advisory issued on 2021-01-09 at 03:00 UTC.

    Key information extracted from original VAA message :


    Aviation Colour Code :  


  • Volcanic ash reported to flight level 100 (3000m) at 09 0145 UTC.
  • Cvghm vona reported pyroclastic ow with volcanic ash cloud at 09/0145z, and volcanic ash has since dissipated. Volcanic ash was not discernible on satellite img. Advisory will be updated if new information is received.

Original Message :

Volcanic Ash Advisory issued on 2021-01-07 at 03:34 UTC.

    Key information extracted from original VAA message :


    Aviation Colour Code :  


  • Disctrete eruption to flight level 100 (3000m).
  • Ground report of volcanic ash to flight level 100 (3000m) at 07/0102z, eruption has since ceased and volcanic ash cannot be identified on satellite imagery. Advisory will be updated if new information is.

Original Message :

Volcanic Ash Advisory issued on 2020-11-30 at 00:00 UTC.

    Key information extracted from original VAA message :



Original Message :