| Type |
Formation - Dissolution |
|
RADIATION |
Clear Nite , Wind < 5
mph , Radiational Cooling Heavier Cold Air flows into Lower Places Fog forms as Air Cools to Dew Point < 200 ' Morning Sun raises Temp above Dew Point, Wind mixes Warmer Air |
| VALLEY | Large Valleys in Winter w/
surrounding Mountains, can exceed 1.500' Winter Sun may not be enough to Dissipate, can raise Fog to 500' Can last for days until Strong Wind/ Storm Dissipates |
| ADVECTION | Warm , Humid Air moves Inland
Horizontally in Winter Air Cooled to Dew Point by Cooler Ground Can cover large areas , Dissipated by Sun or Wind |
| UPSLOPE | Warm , Humid Air moves up
Hill or Mountain Fog forms as Temp drops to Dew Point - Adiabatic Temp Change Dissipated by Sun or Wind |
| SEA SMOKE STEAM |
Cool Air moves over Warm
Water Water Evaporates into Cool Air increasing to Dew Point forming Fog Can see 'Steam' rising from ponds & lakes in Fall 1- 2" above water Dissipated by Wind |
| PRECIPITATION | Some Rain Evaporates if warmer
than Air Vapor reaches Dew Point - Fog forms Dissipated by Sun or Wind after Rain stops |