Air Pressure

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Air Pressure
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High and Low Pressure Areas

• High pressure causes air to sink
• Usually results in several days of clear sunny
  skies

• Air rises in low pressure areas and forms water
  droplets
• Usually results in rain and storms

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Fronts
Where air masses meet and do not mix
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When two air masses meet, they form a front.
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During a cold front, a cold air mass catches up
to a warm air mass and pushes the warm air up
quickly. Weather associated with cold fronts
is Thunderstorms
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See A Cold Front Forming. Click Here!
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The map symbol for a cold front is a curved line
with small blue spikes
When cold air catches up to warm air and pushes
it up and away, what is formed?... cold front
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From the map above, you can predict that the
weather in the southern U.S. will be getting
colder
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See A Warm Front Forming. Click Here!
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The map symbol for a warm front is a curved line
with small rounded knobs
When warm air catches up to a cold air mass,
what is formed?... warm front
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When a warm air mass catches up with a cold air
mass, it forms a warm front The warm
air slides over the top of the cold air, before
pushing it away. Weather associated with warm
fronts are. Clouds and long periods of steady
rain
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From the map above, you can predict that the
weather over the Great Lakes will be getting
warmer
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• Warm or cold front stops moving.
• Light wind and precipitation may occur across the
  front boundary

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• One front overtakes another
• Cold front typically faster moving
• Can have warm and cold occluded fronts
• Creates Precipitation

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Name the Weather Fronts