• Fog forms when humid air near the ground cools below its dew point.
  • Each type of fog forms in a different way.
  • Tule fog is an extreme form of radiation fog.
  • Steam fog appears in autumn when cool air moves over a warm lake.
  • Upslope fog is created when warm humid air travels up a hillside.
  • Fog levels are declining along the California coast as climate warms.
  • The change in fog may have big ecological changes for the state.
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