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Air Masses and Fronts
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What changes do you feel in the weather right before a thunderstorm?
• Skies get dark• Gets windy• Gets colder
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Recipe for a storm
• Compare the skies between a thunderstorm and a tornado.
• Do you see any similarities?• Do you see any differences?
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Thunderstorms
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Tornadoes
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Can air move around?
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Air Mass animation
• http://www.classzone.com/books/earth_science/terc/content/visualizations/es2001/es2001page01.cfm?chapter_no=visualization
• All around the earth, large masses of air move around and constantly change the weather.
• They are named based on where they are coming FROM.
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What type of weather would the following air masses bring?
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What do the following terms mean?
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Copy the following slides on page 14 of your Interactive Notebook
• If it is in YELLOW, you are to copy it in your notebook.
• Title the page “Air Masses Descriptions”
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There are four types of air masses.
• Air masses are named based on where they are coming FROM
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Continental Polar
• Cold, dry air mass that forms over central and northern Canada and Alaska
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Continental Tropical
• Hot, dry air masses that form over Southwest and northern Mexico
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Maritime Polar
• Cool, humid air masses that form over the icy cold North Pacific and North Atlantic oceans.
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Maritime Tropical
• Warm, humid air masses that form over tropical oceans such as the Gulf of Mexico
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Classifying Air MassesWet (Maritime) Dry (Continental)
Warm(Tropical)
Maritime Tropical Continental Tropical
Cold(Polar)
Maritime Polar Continental Polar
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Write on page 13:Fronts Activity
• Listen to the instructions• Do activity
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On page 13 of your Interactive Notebook, answer the questions
below.• The water represents air. Knowing this,
explain how you think air behaves when air of different temperature meet.
• Write your answer in complete sentences.• Using the color pencils, draw what you made
and label.
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Fronts (Copy on page 13)
• A boundary created when two air masses meet.• Fronts are named for the air mass
that is moving.
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In the activity that we just did…
•Where is the “front”?
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Fronts animation
• http://www.classzone.com/books/earth_science/terc/content/visualizations/es2002/es2002page01.cfm?chapter_no=visualization
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Fill in the “Weather Fronts” chart as you follow along the next few
slides.
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Cold Front • Cold dense air moves in and pushes warm
air out of the way• Cold fronts move very quickly and bring
short periods of rain/thunderstorms• Lower temperatures are behind the front • SYMBOL – the direction of the “arrows”
points towards the direction the front is MOVING
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A cold front
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Warm Front
• Warm air moves up the cold front as it slowly displaces and overtakes the cold air
• Warm fronts move slowly, and bring many days of steady precipitation
• Higher temperatures are behind the front• SYMBOL – direction of “half-moons” is the
direction the front is moving
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Warm front
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Animations
• http://www.classzone.com/books/earth_science/terc/content/visualizations/es2002/es2002page01.cfm?chapter_no=visualization
• Cold front• Links to cold front videos
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Stationary front
• Created when cold and warm masses meet but neither one has enough force to move the other out of the way.
• The water vapor in the warm air condenses into rain, fog, snow, clouds.
• Can bring many days of precipitation
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Links
• Stationary front videos
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Occluded front
• Is created when a warm air mass is caught between two cooler air masses.
• The two denser cooler air masses cut off the warm air mass from the ground.
• As the warm air mass cools, it may turn cloudy, rainy or snowy.
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Watch video clip of a weather report.
• http://www.youtube.com/watch?v=HQrB37YQo9Y start at 2:10
• http://www.youtube.com/watch?v=OdcCMn5sbzM&feature=related start at 1:30
• http://www.youtube.com/watch?v=nS1nwfRUaaU&feature=related start at :30
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Do a weather report
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Use the graphic organizers and your interactive notebook to complete your
homework.