In the Clouds

In the Clouds, originally uploaded by jw_creations.

It may sound odd, but fog is itself a cloud in contact with the ground, and technically only differs from other clouds in that it touches the surface of the Earth.

Fog forms when water vapor in the air at the surface begins to condense into liquid water. Fog normally occurs at a relative humidity of 100%, and this can be achieved by either adding moisture to the air or dropping the ambient air temperature. A reading of 100% relative humidity does not mean that the air can not hold any more moisture, but the air will then becomes known as supersaturated.