Discuss the characteristics, movements and source regions of North American air masses

AIR MASSES

An air mass is a large body of air that has relatively uniform temperature and moisture characteristics throughout its volume. The area where an air mass acquires its traits is called a source region. For example, air with a source region over cool ocean water tends to become cool and moist while air that stagnates over the

Southwestern U.S. in summer becomes hot and dry. Air masses are set into motion by passing high and low pressure cells. When the air mass moves out of its source region, its temperature and moisture conditions are carried with it.

1. Air masses are classified according to their source region: land vs. water and latitude of origin. Explain/define the meaning of each of the following air mass classification letters.

c: ______________________________
m: ______________________________
P: ______________________________
T: ______________________________

Lecture Reference Material:
• Chapter 8 (Midlatitude Weather Systems)
Objectives:
• Discuss the characteristics, movements and source regions of North American air masses
• Define and draw a profile of a typical warm front
• Define and draw a profile of a typical cold front
• Diagram and label all parts of an idealized, mature, midlatitude cyclone
• Interpret the data presented on a surface weather map
• Prepare and analyze a simple surface weather map using standard techniques
• Use a surface weather map to forecast the weather for a city

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