Air Masses
Changes in weather are caused by the movement of air masses.
An AIR MASS is a very large volume or block of air w/ similar temp. & humidity (moisture) throughout.
An air mass’s humidity & temp. depend on the area where it formed or its source region.
Therefore you name air masses to describe their temperature & humidity.
Moisture descriptions Temp. descriptionsContinental (dry) Polar
Maritime (wetter) Tropical
The 4 major masses are:The 4 major masses are:
Type/NameWhere if Forms
Temperature
Humidity
Maritime Polar
Maritime Tropical
Continental Polar
Continental Tropical
Air masses and source regions for North American
Air masses and source regions for the world
AIR FRONTS
When two different air
masses meet & don’t mix they make fronts.
Fronts bringing changes in the
weather & possibly precipitation.
There are four types of fronts
• Cold
• Warm
• Stationary
• Occluded
https://s-media-cache-ak0.pinimg.com/originals/80/6d/36/806d36c0404d3afec7f55b24615a8092.jpg
After the frontthe weather usually is clear and sunny
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