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16.2 CHANGING WEATHER. Learning Targets 1.Describe the characteristics of air masses and how they get those characteristics 2.Discuss what happens when.

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Presentation on theme: "16.2 CHANGING WEATHER. Learning Targets 1.Describe the characteristics of air masses and how they get those characteristics 2.Discuss what happens when."— Presentation transcript:

1 16.2 CHANGING WEATHER

2 Learning Targets 1.Describe the characteristics of air masses and how they get those characteristics 2.Discuss what happens when air masses meet 3.List the differences between stationary, cold, warm, and occluded fronts

3 Formation of Air Masses 1.Air with similar temperature and humidity (characteristics) 2.Source Region - Temperature and humidity based on where they form or travel across 3.May be 1000 miles across

4 Formation of Air Masses 1.Storms form when air mass and region it moves over have different characteristics a)Cold air mass moving over warmer ground i.Bottom layer heated, air rises, form clouds and precipitation b)Warm air mass moving over colder ground i.Forms inversions

5 Types of Air Masses 1.Cold air masses flow toward equator 2.Warm air masses flow toward poles 3.Continental (c) or Maritime (m) – Source Region a)Arctic (A) b)Polar (P) c)Tropical (T) d)Equatorial (E) } Latitude

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8 Fronts 1.Storms 2.Where 2 air masses meet a)Different temperature, humidity, density 3.Do NOT mix 4.One goes up; one goes down 5.Hot is less dense  goes up

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10 Stationary Front 1.Neither air mass is moving 2.Steady wind and precipitation

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14 Cold Front 1.Cold air moving into area covered by warm air 2.Cold (dense) air pushes warm (less dense) air up a)Humidity high enough forms clouds and precipitation b)Remember - warm air holds more moisture

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20 Cold Front varies with Seasons 1.Spring & Summer – Air unstable create thunderstorms & tornadoes 2.Spring – If temperature gradient high, strong winds blow 3.Autumn – Strong rains 4.Winter – Source region in arctic bringing frigid temperatures and snows

21 Warm Front 1.Warm air moving over land covered by cold air 2.Warm air is slides over cold air a)Atmosphere is stable create inversions

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29 Occluded Front 1.Forms around a low pressure zone L 2.Cold front catches up with a warm front a)Air masses are cold, warm, cold b)Variable and unpredictable weather as the various air masses mix c)Cyclones  more on this later

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