1. Air Masses

2. Air Masses
An air mass is a large body of air that takes on characteristics of the air over which it forms over
Source region
Air masses can form over land or water
Air masses take on the temp of where they form and those that form over land are drier of those formed over water

4. httpSummer and Winter Air Masses

5. Air Mass Modification Air masses do not stay in one place indefinitely
The air mass will move and can take over new characteristics because the land below it is different then the source region
When this happens, it is called air mass modification