1. Air Masses and Fronts Page 21 Air mass
A. ____________- is a large body of air, in the troposphere, with similar characteristics of ___________, ___________ and ____________
B. Air Masses get these properties based on their _________ ________
Source Region= ______________________
__________________________
temperature
moisture
pressure
Source
Region
the geographic area where an air mass forms

2. How Do Air Masses Form? Page 21
Air stagnates or sits over a particular region for a period of time, a week or two, acquiring the temperature and moisture of that surface
Air masses have the same characteristics as their source region

3. The abbreviations used to classify air masses
use the following letters: c, m, T, P, and A.
For each letter, describe its property:
Page 21
Word
Means c m T P A
continental
dry
maritime
moist
Tropical
warm
Polar
cold
Arctic
very cold

4. Types of Air Masses Page 21 Dry & Cold cP continental Polar
Symbol
Name of air mass
Characteristics
Dry & Cold cP
continental Polar
Moist & Warm mT
maritime Tropical
Dry & Warm cT
continental Tropical
Moist & Cold mP
maritime Polar cA
continental Arctic
Very cold, very dry

5. Use ESRT page 13 to label Diagram

6. What type of air mass would form over each area? Please label. cA mPcP cT mT mT mT
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7. Page 13 Diagram- Check your Work

8. What would their characteristics be?mT cP
warm and moist
Cold and dry
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9. High or Low Pressure? mT cP H L
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10. Page 21

11. Page 21

12. Review-Air Masses Page 21 Air Mass Classification
Temperature due to Latitude:
A for Arctic,
P for Polar,
T for Tropical;
Moisture Content Identifiers:
c for continental (meaning the air is relatively dry),
m for maritime (meaning the air is relatively moist);
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16. This map shows the air mass source regions and their paths

17. Source Regions &Air Masses
Cold Front Video 0:14
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18. Ok, now we see the difference in the air masses
Let’s look at the different fronts and their impact on weather
Can you see the four different types of fronts on the map?

19. Questions Page 28 3 2 4 1

20. a boundary or interface Between 2 different air masses
FRONTS
a boundary or interface
Between 2 different air masses
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21. Use ESRT page 13 to label Diagram21

22. Fronts _____________________________
A boundary _________________________
4 Types of Fronts
_______________
Weather Is usually occurring near a front
Between 2 air masses
cold
warm
stationary
occluded
Pg. 13 E.S.R.T. 
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23. The Rule: triangles and bumps always point in the direction the front
is moving
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25. Cold Front-
occurs when heavy cold air displaces lighter warm air, pushing it upward. Precipitation occurs ON a cold front
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26. Cold Fronts
Class Zone Animation #1
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27. Warm Front-
occurs when warm air replaces cold air by sliding over it. Precipitation occurs AHEAD of a warm front.
Front
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28. Warm Fronts
Page 22

29. Cold &Warm Fronts
Video 2:26 Minutes
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30. The Weather Highways
The rotation of the earth creates the Coriolis effect.
The Coriolis effect causes the air and water to be deflected to the right north of the equator.
This creates global weather highways

31. The Westerlies
Because of our latitude, most of our weather comes from the west
Looking at the weather map, what type of weather might we expect?
What type of weather might we expect in a few days?

32. Weather follows a pattern from West  East (NE) in the U.S.

33. Questions from Pages 23-24 3 1 2 4 1 3 4 2 4 3 1

34. Questions from Page 25