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Air Masses & Fronts. Weather is caused by the movement & interaction of air masses. Air Mass - large body of air that has properties similar to the part of the Earth’s surface over which it develops . Each Mass is described with a Temperature & Moisture Ex: Hot / Dry Ex: Cold / Moist.

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Air Mass masses- large body of air that has properties similar to the part of the Earth’s surface over which it develops

  • Each Mass is described with a Temperature & Moisture

  • Ex: Hot / Dry

  • Ex: Cold / Moist


Characteristics of air
Characteristics of Air masses

  • Air mass that forms over tropics is _______ than one that forms over the northern regions.

  • Air mass that forms over water is more ______ than one that forms over dry land.


Highs lows
Highs & Lows masses

  • Recall: Winds blow from an area of ______ pressure to an area of _____ pressure!

  • (high to low)


High pressure system
HIGH PRESSURE SYSTEM masses

  • Associated with fair / nice weather because the high pressure does not allow air to rise and form clouds

  • Hint: Think of High 5= Good Weather

  • Or Thumbs UP!


Low pressure system
LOW PRESSURE SYSTEM masses

  • Associated with cloudy weather because the warm air rises and forms clouds

  • Thumbs Down


Fronts boundary that forms between 2 different air masses
Fronts- boundary that forms between 2 different air masses masses

  • It is usually cloudy and stormy at a front

  • 4 Types

    • Cold

    • Warm

    • Occluded

    • Stationary


Familiar fronts
Familiar Fronts masses

In your journals, identify these symbols


Front drawings
Front Drawings masses

  • Divide your paper into four equal sections

  • Read the FRONTS section on page 127 & 128

  • Label each section with the 4 fronts:

    • Cold Front, Warm Front, Occluded Front, Stationary Front

  • Describe what happens at each front & what type of weather occurs

  • Draw a picture of each front & use Red & Blue colored pencils to add color.

  • INCLUDE THE SYMBOL OF THE FRONT!!!!!!


Cold front
Cold Front masses


Cold fronts continued
Cold Fronts Continued masses

  • Fronts move in the direction they are headed!

  • Tips: The blue triangles on a cold front= think of icicle

  • Q: What types of temperatures are left after a cold front moves through?

  • Q: What direction is this cold front moving?


Warm front
Warm Front masses


Warm fronts continued
Warm Fronts Continued… masses

Hint: The half circles on a warm front= think of the sun

  • Q: What types of temperature are left after a warm front moves through?

  • Q: What direction is this warm front moving?


Stationary front
Stationary Front masses

  • Neither cold nor warm air advances.

  • Hint: Think of the line of scrimmage in a football game when both teams equally push against each other

  • OR a Stationary Bike!



Occluded front continued
Occluded Front Continued… masses

  • Hint: The 2 C’s in oCCluded for 2 cold air masses.

  • Cold air masses close out the warm air from the surface.

  • The only front that includes ____ air masses. ( How many air masses are involved?)


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