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When Does Fog Occur? - Coggle Diagram

- - - - Cooling from adjacent air & ground
      - Clear skies, light wind, high relative humidity
      - Thickest fog in valleys
    - - Advection Fog
        
        Occurs when warm air blows over a cold surface
        
        Winds between 10-30km/hr are required
        
        Warm air is cooled by cold water below
        
        Lasts longer than radiation fog
        
        1000-2000 feet above surface
    - - Humid air moves up slope
      - Layer of fog forms when dew point is reached
      - Air expands and cools
- - - - Saturated air rises
      - Moisture evaporates
      - Cool air blows over warm water
      - Common occurrence over bodies of water when air is cold
      - Heat and moisture from water transfer into the air
    - - Cooler air becomes saturated
      - Thick fog
      - Warm & wet air rises over cold & dry air
      - Most common with light rain