Precipitation

Fog

1. Convection: When air is warmed it expands and then rises creating low pressure. 
2. Frontal: When moist air rises due to a mountain or meeting a mass of air that is colder and denser than itself.
3. Advection: When warm, moist air is cooled as it crosses over a cooler sea or land surface.
4. Radiation cooling: When skies are clear at night, the ground loses heat very quickly. As a result, the air directly above the ground also cools quickly. Dew may form.

Humidity: This is the amount of water vapour in the air. 

Precipitation

At the most comprehensive level, precipitation includes…