Fata bromosa
From Glossary of Meteorology
fata bromosa
An apparent fog in the distance where no fog actually exists.
The appearance is sufficiently compelling that one can observe ships, say, vanishing into or emerging from the seeming fog. The fata bromosa seems to be an infrequent partner of the superior mirage. The name translates as “fairy fog.”
Compare fata morgana.
Compare fata morgana.