When the volcano color code changes, a Volcano Observatory Notificatio
![AVIATION COLOR CODES](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/USGS__Volcano_Hazards_Program.png?itok=gfpE-gL4)
Detailed Description
AVIATION COLOR CODES
When the volcano color code changes, a Volcano Observatory Notification for Aviation (VONA) is issued.
Sources/Usage
Public Domain.
AVIATION COLOR CODES
When the volcano color code changes, a Volcano Observatory Notification for Aviation (VONA) is issued.
Public Domain.