1. OBJECTIVE: Describe the four major types of fronts.
INTRO
Write Q&A in notebook:
What does temperature have to do with weather?
Do certain temperatures create certain types of weather?

2. Air Masses and Fronts

3. Air Masses and Fronts air mass 4 types of air masses
A large body of air where temperature and moisture content are constant throughout.
Changes in weather are caused by the movement and interaction of air masses.
Maritime
Continental
Polar
Tropical

4. Air Masses and Fronts Maritime (m) Continental (c) Polar (P)
Tropical (T)
Forms over water
Moist / wet
Forms over land
Dry
Forms over polar regions
Cold
Develops over the tropics
Warm

6. Fronts Front 4 Types of Fronts The boundary between air masses
Remember:
Cold air – is dense
Warm air – less dense
Cold
Warm
Occluded
Stationary

7. Air Masses and Fronts Cold Fronts
Forms where cold air moves under warm air, which is less dense, and pushes the warm air up.
Brings sever thunderstorms, heavy precipitation
Followed by cool, clear weather

9. Air Masses and Fronts Warm Fronts
A warm front forms where warm air moves over cold, denser air.
Brings drizzly rain
Followed by clear, warm weather

11. Air Masses and Fronts Occluded Front
Forms when a warm air mass is caught between two colder air masses.
Brings cool temperatures and large amounts of rain or snow.

13. Air Masses and Fronts Stationary Front
Forms when cold and warm air masses collide and cannot move past each other
Brings many days of cloudy, rainy weather.