FOG
FOG: a cloud near the ground; visibility reduced to under 5/8ths of a mile .... otherwise, MIST.
CLOUD CONDENSATION NUCLEI (CCN): smoke, dust, salt.
ICE NUCLEI: must have a crystal lattice structure similar to ice.
HYGROSCOPIC NUCLEI: chemical affinity for water molecules; can initiate condensation at a relative humidity as low as 70%.
RADIATION (ground) FOG: forms on a clear, calm night, with humid air near the ground; dry aloft; most common in Autumn.
ADVECTION FOG: the movement of air over a modifying surface; warm/moist air moving over a snowpack or cold water; San Francisco Fog.
ARCTIC SEA SMOKE: extremely cold, dry air flowing over a large, unfrozen body of water; also called STEAM FOG; lower portion becomes warmer and more moist, leading to destabilization, further causing filaments or streamers of fog to appear, like "smoke"; also called: FATA MORGANA.
USLOPE FOG: cooling and condensation due to rising air up a mountain slope.
DEW: when water vapor condenses on object with Sfc-T > 32 F; best seen on a spider's web.
FROST: when water vapor condenses on objects with a Sfc-T <= 32 F; feather pattern seen on windows.
HOARFROST: fernlike crystals that grow on twigs and branches of trees (can be several cm in length).
HAZE: floating dust, smoke or salt particles that reduce visibility; too dry for water to condense, even on hygroscopic nuclei.