Air Pressure Flashcards
1
Q
Warm Air
A
- molecules far apart
- move around a lot
- less dense
2
Q
Cold Air
A
- molecules close together
- molecules not moving around much
- more dense
3
Q
High pressure
A
- air is sinking
- high amounts of pressure on the ground
- sunny, little wind
- can be foggy in winter
4
Q
Low pressure
A
- air is rising
- low amounts of pressure on the ground
- clouds, rain often, can be windy
5
Q
What is an Air Mass?
A
A body of AIR with a SIMILAR TEMPERATURE, HUMIDITY and PRESSURE. As a result, they bring similar weather conditions.
6
Q
Warm front
A
- the boundary between a mass of warm air and a retreating mass of cold air
- warm air moves over the cooler air causing light precipitation (drizzle)
- warm dry weather follows when the air passes
7
Q
Cold front
A
- cold air mass pushes into a warmer air mass
- can produce dramatic changes to weather
- move fast, up to twice as fast as a warm front
- moves under warm air very quickly, bringing storms
- most tornadoes develop from thunderstorms on the edge of a cold front
8
Q
Occluded front
A
- when a cold front overtakes a warm front
- cool and cold masses come together and force warm air up
- brings cool temperatures with large amounts of snow
9
Q
Stationary front
A
- happens when two masses of air are pushing against each other
- but nether is powerul enough to move the other
- so they stay in one place for an extended period of tie
- many days of cloudy, wet weather
