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Air Masses and Fronts

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Air Masses and Fronts Warm Up: What type of rock is formed from cooling lava? Air Mass VIDEO Clip Air Masses Air masses have the same properties as the surface ... – PowerPoint PPT presentation

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Title: Air Masses and Fronts


1
Air Masses and Fronts
Warm Up What type of rock is formed from
cooling lava?
2
? Air Mass VIDEO Clip ?
3
Air Masses
  • Air masses have the same properties as the
    surface over which it develops
  • Maritime Wet
  • Continental Dry
  • Polar Cold
  • Tropical Warm

mP wet/cold cP dry/cold mT wet/warm cT
dry/warm
4
Air Masses in North America
5
Fronts
  • A front is the boundary where two air masses
    meet.
  • Types of fronts
  • Warm Front
  • Cold Front
  • Occluded Front
  • Stationary Front

6
Front VIDEO Clip ?
7
Cold Front
  • Cold dense air pushes under a warm air mass.
  • The cold dense air moves faster and causes the
    warm air rises quickly.
  • Narrow bands of violent storms form.

8
Why do cold fronts bring heavy rain and storms?
  • Cold air interacting with warm air a sudden
    drop in temperature CONDENSATION occurs quickly
    and a fast difference in pressure
  • Creates cumulonimbus clouds
  • Cold dense fast moving air high winds

What you see in a weather map!
9
Cold Front Video Clip
10
Warm Front
  • Warm air slides over departing cold air.
  • Large bands of precipitation form

11
Why do warm fronts bring mild weather?
  • Its more difficult for the warm air to move
    against the cold dense air so there is a gradual
    difference in pressure and temperature

What you see in a weather map!
12
Warm Front Video Clip
13
Occluded Front
  • Two cold air masses merge and force warm air
    between them to rise quickly.
  • Strong winds and heavy precipitation will occur.

14
Why do occluded fronts bring heavy rain and
storms?
  • Cold air that is more dense moves into an area of
    low pressure CONDENSATION occurs quickly
  • Forms cumulonimbus and nimbostratus clouds

What you see in a weather map!
15
Stationary Front
  • Warm and/or cold front stops moving.
  • Light wind and precipitation may occur across the
    front boundary.

16
Why do stationary fronts bring long light
precipitation?
  • Neither front is strong enough to move the other
  • Can stay put for days
  • Differences in temperature rain or snow

What you see in a weather map!
17
Cyclones and Anticyclones
  • Areas of HIGH and LOW pressure
  • Cyclone LOW PRESSURE spin counterclockwise
    associated with storms and precipitation
  • Anticyclone HIGH PRESSURE spin clockwise
    associated with fair weather.

18
Cyclones and Anticyclones in the USA
19
Cyclone Video Clip ?
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