fogfall

plural fogfalls

1. The act or time of a cloud of fog falling over an area.

   It becomes surface water runoff through atmospheric scouring associated with rainfall and fogfall.

   1998, Keith B. Hoddinott, Superfund Risk Assessment in Soil Contamination Studies: Third Volume, →ISBN

2. An instance (i.e. a cloud) of fog that has fallen or developed over an area.

   He could see it gilding the ridges westward and slowly burning the fogfall that lay over Topanga Park.

   2003, Christopher Sandford, McQueen: The Biography, →ISBN, page 339

   2 more examples

   The fogfall that lay along the crest in a cottony roll was as white as the clouds of a fairytale. Only the heads of the men in the skip were visible from where she stood just outside the door of the shaft house.

   2000, Wallace Stegner, Angle of Repose, →ISBN

   Roaring in from the south and the ocean, we saw a rolling white bank of clouds falling onto the bay and the town, a thick dense curse of a fog crawling downward, a fogfall,

   2011, Ariel Dorfman, Desert Memories: Desert Memories, →ISBN

3. A tumbling of fog from a higher area to a lower one, visually reminiscent of a waterfall.

   Approximately 1.25 miles of Virginia Highway 58 was rerouted to merge with US Highway 25E south of the gap. This photograph shows the phenomenon of the “fogfall,” when fog trapped in the meteorite crater of Middlesboro escapes [...]

   2014, Martha Evans Wiley, Cumberland Gap National Historical Park, page 117