1. Air Masses
and
Fronts

2. Air Mass:
A huge body of air with similar temperature, humidity, and air pressure throughout

3. Air masses are classified by temperature and humidity.
Continental Polar
Maritime Polar
cold
Continental Tropical
Maritime Tropical
warm
dry
wet
Humidity
Temperature

4. The temperature and humidity of the air depends on where the air mass formed.

6. the prevailing westerlies and the jet streams.
In the United States, air masses are commonly moved by:
the prevailing westerlies
and the jet streams.

7. The boundary between air masses is called a front.
When two or more air masses with a different temperature and humidity collide, they do not mix easily. This causes storms to develop and weather to change.
The boundary between air masses is called a front.

8. Types of
Fronts

9. What Kind of Weather it Causes
Type of Front
When it Happens
What Kind of Weather it Causes
Weather Map Symbol
Cold air advances toward warm air and pushes it up.
Sudden thunderstorms and tornadoes
Cold Front

10. What Kind of Weather it Causes
Type of Front
When it Happens
What Kind of Weather it Causes
Weather Map Symbol
Warm air advances over colder air.
Steady rains
Warm Front

11. What Kind of Weather it Causes
Type of Front
When it Happens
What Kind of Weather it Causes
Weather Map Symbol
Cold air moves toward cooler air with warm air in between. Warm air gets trapped above.
Some storms and steady rains
Occluded Front

12. What Kind of Weather it Causes
Type of Front
When it Happens
What Kind of Weather it Causes
Weather Map Symbol
Both air masses remain still. Neither warm air nor cold air advances.
Steady rains
Stationary Front

13. say to the other air mass?
What did one air mass
say to the other air mass? ? ?