Earth Science 9H; Air Masses, Fronts, and Station Models Study Guide
Terms in this set (28)
What is an air mass?
An air mass is a large body of air with uniform temperature and uniform moisture.
If a continental polar air mass moved over the Ashburn area, what would change?
Temperatures and humidity would decrease. (It would become colder and drier)
How are Air Masses classified?
Air masses are classified by temperature and humidity.
Which air mass causes most of the precipitation in the eastern United States?
Maritime Tropical over the Caribbean Sea.
Which two air masses mainly influence much of the east coast?
Maritime Tropical and Continental Polar.
Why does the Continental Tropical air mass centered over Mexico have little influence on weather in the east?
Air Masses don't travel far from their source regions.
Air masses that form over land are called...
Air masses that form over water are called...
What is a warm front?
The boundary between advancing warm air mass & a colder air mass it is displacing.
What kind of front forms when a cold front overtakes a warm front?
An occluded front
What happens along stationary fronts?
The front stops moving forward, producing clouds & precipitation.
What kind of weather is associated with cold fronts?
Wind, heavy rain, Thunderstorms, Lightning, clearing and colder air after front passes.
What forms at the boundary between two different air masses?
Which types of fronts are most likely to produce thunderstorms?
Cold and Occluded fronts
Which type of front is the most complex because it involves 3 different air masses?
Which type of front would you see cirrus clouds a day before rain showers?
The ________ tropical air mass can cause very hot, drought-like conditions during summer on the Great Plains.
Heavy rain, on the windward slopes of mountains near the Pacific NW is caused by the uplift of air in ________ polar air masses.
A ________ front can bring heavy rain and thunderstorms.
Cold or Occluded
At a(n) _______ front, the flow of air stops moving forward.
A warm, moist air mass moves northwest over a cool, dry area. How will the air mass affect the temperature and humidity of the area it moves over?
It will bring warmer temperatures and higher humidity (and possibly rain)
How will this [A warm, moist air mass moves northwest over a cool, dry area] affect the temperature and humidity of the air mass itself?
The air mass will eventually cool down and become drier.
Which air masses bring cool, dry air to large regions of eastern North America?
Continental Polar and Continental Arctic
- Warm and Wet
- Low latitudes over water
- Southwest and Southeast US
- Cool and Wet
- High latitudes over water
- Northeast and Northwest US
- Cold and Dry
- High latitudes over land
- Midwest to Eastern US
- Warm/Hot and Dry
- Low latitudes over land
- Southwest US
- VERY Cold and Dry
- Very high latitudes over land
- Northern US in winter