Two feathers of cloud perfectly aligned in the skies over Waldoboro, Maine US. What can have caused them? A couple of aircraft climbing or descending through this layer of Altocumulus, that’s what. The features, known as ‘cavum’, or fallstreak holes, are where a region of the ‘supercooled’ droplets in the Altocumulus layer were encouraged to freeze by the air cooling in the vortices of the aircraft’s wings. But why are the two features so perfectly aligned? The two aircraft were likely following the same flight path, one a little time after the other, and the cloud layer simply drifting sideways in the wind between flights. .
Altocumulus with cavum features spotted over Waldoboro, Maine, US, by Carole Martin (Member 44,094).
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