fogfalls

Noun

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.
   • 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
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