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21 Cards in this Set

  • Front
  • Back
Q
air mass
A
A huge body of air that has similar temperature, humidity, and air pressure throughout it.
Q
Name the 4 major types of air masses that influence the weather in North America.
A
1. maritime tropical
2. continental tropical
3. maritime polar
4. continental polar
Q
Describe a tropical air mass.
A
A warm air mass that forms in the tropics and has low air pressure.
Q
Describe a polar air mass.
A
A cold air mass that forms north of 50˚N or south of 50˚S and has high air pressure.
Q
Describe a maritime air mass.
A
An air mass that forms over water and is moist.
Q
State 3 characteristics of a maritime tropical air mass.
A
1. warm
2. humid
3. forms over oceans near the tropics
Q
State 3 characteristics of a maritime polar air mass.
A
1. cool
2. humid
3. forms over the icy cold North Pacific and North Atlantic Oceans
Q
cyclone
A
A swirling center of low pressure.Cool air spirals inward.
Q
Anticyclone
A
High pressure centers of dry air. The wind spirals out.
Q
What direction does a cyclone turn in North America?
A
Winds of a cyclone (L) spin counterclockwise.
Q
What direction does an anticyclone turn in North America?
A
The winds of an anticyclone (H) spin clockwise.
Q
State 3 characteristics of a continental tropical air mass.
A
1. hot
2. dry
3. form over dry areas of the Southwest
Q
State 3 characteristics of a continental polar air mass.
A
1. cool or cold
2. dry
3. forms over northern Canada or Alaska
Q
When two air masses meet, why does the warm air mass rise?
A
The warm air mass has a lower density than the cold air mass.
Q
What is a front?
A
The area where two air masses meet but do NOT mix.
Q
Name the four types of fronts.
A
1. cold front
2. warm front
3. stationary front
4. occluded front
Q
cold front
A
Moving cold air meets a warm air mass and puches the warm air up and over the cold air.
Q
warm front
A
Moving warm air mass meets and moves over the cold air.
Q
occluded front
A
A warm air mass is cought above a cold air mass and a cool air mass that are close to the ground.
Q
stationary front
A
Cold and warm air masses meet and neither one has enough force to move.
Q
What three things (characteristics) are similar in an air mass.
A
1. similar temperature
2. similar air pressure
3. similar humidity