1. Today is Tuesday, December 18, 2012
HOMEWORK: Read Chapter 8, Lesson 2
Warm UP:
Place your hand ABOVE the hot water on your desk. Why does the air feel warm and humid (moist?)

2. Goal for Today
SWBAT demonstrate an understanding of air masses moving by discussing the effects when two air masses meet.

3. Air mass – large body of air with similar properties all through it (usually temperature and humidity – amount of water vapor in the air)
Continental Polar Air
Continental Tropical Air
Maritime Polar Air
Maritime Tropical Air

4. Front – boundary between two air masses
Cold front – cold air moving into warm air mass
Warm front – warm air mass moving into cold air mass
Stationary front – front that doesn’t move much or it moves back and forth over the same area

5. Fronts

9. Closing it up…. In table groups, discuss the following:
What type of front creates a thunderstorm?
What kind of front is blowing in on a warm sunny day?