- Convection: When air is warmed it expands and then rises creating low pressure.
- Frontal: When moist air rises due to a mountain or meeting a mass of air that is colder and denser than itself.
- Advection: When warm, moist air is cooled as it crosses over a cooler sea or land surface.
- 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.
At the most comprehensive level, precipitation includes…