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  •  Fog is a cloud that begins within 50 feet of the surface. It typically occurs when the temperature of air near the ground is cooled to the air’s dew point.
  • At this point, water vapor in the air condenses and becomes visible in the form of fog.
  •  Fog is classified according to the manner in which it forms and is dependent upon the current temperature and the amount of water vapor in the air.
  • On clear nights, with relatively little to no wind present, radiation fog may develop.
  • Usually, it forms in low-lying areas like mountain valleys.
  •  This type of fog occurs when the ground cools rapidly due to terrestrial radiation, and the surrounding air temperature reaches its dew point.
  • As the sun rises and the temperature increases, radiation fog lifts and eventually burns off.
  •  Any increase in wind also speeds the dissipation of radiation fog.
  • If radiation fog is less than 20 feet thick, it is known as ground fog.

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