Air Masses

An air mass is a large volume of air that has relatively uniform temperature and moisture content within a given altitude. Air masses are classified based on their source regions and are responsible for various weather patterns as they move across the Earth's surface.

Classification of Air Masses

There are four primary classifications of air masses:

• Polar (P): These air masses form over high-latitude regions and are characterized by cold temperatures.
• Tropical (T): These air masses form over low-latitude regions and are characterized by warm temperatures.
• Continental (c): These air masses form over land and are generally dry.
• Maritime (m): These air masses form over water bodies and are typically moist.

Types of Air Masses

Based on their source regions, air masses are classified into the following types:

• Continental Arctic (cA): Extremely cold and dry air masses that originate over the Arctic region.
• Continental Polar (cP): Cold and dry air masses that form over land at high latitudes.
• Maritime Polar (mP): Cool and moist air masses that originate over water bodies at high latitudes.
• Continental Tropical (cT): Hot and dry air masses that form over land at low latitudes.
• Maritime Tropical (mT): Warm and moist air masses that originate over water bodies at low latitudes.

Weather Patterns

When air masses move into new regions, they interact with the prevailing weather systems and can cause changes in weather conditions. The boundaries where different air masses meet are known as fronts, and the interactions at these fronts often lead to the formation of various weather phenomena, such as thunderstorms, rainfall, and temperature changes.

Study Guide

Here are some key points to remember about air masses:

1. What are the four primary classifications of air masses?
2. Can you classify the air masses based on their source regions?
3. How do air masses influence weather patterns?
4. What are the boundaries where air masses meet called?
5. What types of weather phenomena can be caused by the interactions of air masses at fronts?

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