XL5 well done!
Just don't know a better name than Ectoplasm for the mini cloud that forms within significantly decreased pressure zones of an aircraft when penetrating high humidity air. Often visibility is seriously reduced for a fighter jock when the cockpit is in its little cloud.
Once investigated the break up of an F-86 Sabre which emerged from low cloud diving at high speed at night immersed in ectoplasm. Apparently the pilot reacted violently to the glow of city lights through his personal cloud overstressing the aircraft to break up.
Tis still incredible that water droplets can form and then be returned to vapour so rapidly to create the phenomenon many of us have observed both from the inside and the outside.