Editing Fog (section)

=== Topographical influences ===
{{multiple image
| footer    = Fog over the ''Pedra do Sino'' (Bell Rock; left) and ''Dedo de Deus'' (God's Finger; right) peaks in the [[Serra dos Órgãos National Park]], [[Rio de Janeiro (state)|Rio de Janeiro state]], [[Brazil]]
| width     = 220
| image1    = Nascer do sol em meio à neblina, na Pedra do Sino.jpg
| alt1      =
| image2    = Nascer do Sol no Dedo de Deus.jpg
| alt2      =
}}

'''Up-slope fog''' or '''hill fog''' forms when winds blow air up a [[slope]] (called [[orographic lift]]), [[adiabatic process|adiabatically cooling]] it as it rises and causing the moisture in it to condense. This often causes freezing fog on mountaintops, where the [[Ceiling (cloud)|cloud ceiling]] would not otherwise be low enough.

'''Valley fog''' forms in mountain [[valley]]s, often during winter. It is essentially a radiation fog confined by local topography and can last for several days in calm conditions. In California's [[Central Valley (California)|Central Valley]], valley fog is often referred to as [[tule fog]].
[[File:High Desert Fog.jpg|thumb|[[Yucca Valley, California]] [[tule fog]]]]