Bird mimicking violin tunes How to train a raven! Fallstreak holes, caused when super-cooled water droplets (water below freezing but still liquid) in the cloud are disturbed, often by an aircraft or other particulate, causing them to freeze and fall out, creating a clearing.
Fallstreak holes, caused when super-cooled water droplets (water below freezing but still liquid) in the cloud are disturbed, often by an aircraft or other particulate, causing them to freeze and fall out, creating a clearing.
