VONA notifications

VONA notifications

Aviation color code

The aviation color code (ACC) follows recommendations of the International Civil Aviation Organization (ICAO) and provides pilots, the public, and aviation authorities with information about the status of volcanoes that could affect air traffic.

The aviation color code is independent of the color code also issued by the Icelandic Meteorological Office, known as the “Volcano Alert Level System (VALS).” The VALS color code is intended to convey information about potential impacts on the ground, and therefore, these two color codes may differ at any given time.



Notification of change in aviation color code

Grímsvötn

Time: 22. Jan 2024, 15:37 GMT

Color code:  green 

Volcano id: 373010

Activity summary:
The recent glacial outburst flood (jökulhlaup) from Grímsvötn has peaked in the river Gígjukvísl. The aviation colour-code for Grímsvötn was increased temporarily to reflect the increased likelihood of a volcanic eruption due to pressure-related changes while meltwater drained from Grímsvötn. Now that the jökulhlaup has ended, and there are no measurable signs of short-term, elevated activity, the aviation colour-code has been returned back to green.

Cloud height:
NA

Other cloud information:
NA

Remarks:
The long-term situation at Grímsvötn is considered to be above background levels. Over monthly scales, seismicity at Grímsvötn remains high. Additionally, surface deformation at Grímsfjall has exceeded the level measured before the last eruption in May 2011. Grímsvötn remains a volcano that IMO monitors closely because of long-term unrest.






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