Frontal Systems

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Frontal SystemsHigh and Low Pressure

• Science 10

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Frontal Systems

• Fronts are created when one air mass overtakes
  another
• They will typically be classified into two
  categories
• Warm front when warm air runs into cold air
• Cold front when cold air runs into warm air

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Warm Front
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Warm Front

• The warm air gradually climbs over the colder air
• Typical clouds associated with a warm front are
• Cirrus
• Cirrostratus
• Altostratus
• Nimbostratus
• Stratus
• Associated with periods of steady precipitation
• May exist over 50-100km

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Cold Front
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Cold Front

• Occurs when warm air is violently pushed up by
  advancing cold air
• Cumulus clouds are associated with a cold front
• Can result in cumulonimbus clouds
• Short periods of heavy precipitation
• Covers a small geographical area (2-5km)

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Weather Map
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High Pressure

• High pressure has more air above it
• It is pulled down by gravity
• Due to Coriolis Effect, it spins clockwise and
  out in the Northern Hemisphere
• Clear skies
• Light winds

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Low Pressure

• Low pressure has less air above it
• Air from a high pressure flows towards a low
  pressure
• Due to Coriolis Effect, it spins counter
  clockwise and in in the Northern Hemisphere
• Clouds
• Strong winds

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High and Low Pressures
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Questions Pg. 32 9-12 Pg. 34
13-16
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Pg. 32 9. Spherical Earth makes Suns
more or less concentrated.

• Air Mass- a very large mass of air that has
  nearly uniform properties such as temperature,
  humidity, and pressure.
• -arctic (cold, dry)
• - continental polar (cool, dry)
• - continental tropical (hot, dry)
• - maritime polar (cool, humid)
• - maritime tropical (hot, humid)

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11.
12. Coriolis Effect
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Pg. 34
13. Jet streams are fast flowing, narrow air
currents found in the atmosphere, usually
between the Troposphere and the Stratosphere.
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14. A Front is a zone that develops as a result
of the meeting of two air masses with different
characteristics.

• A Stationary Front- is when two air masses meet
  but neither
• advances.

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16. When cold air replaces warm air we have a
Cold Front. Cold fronts usually bring short
periods of heavy precipitation.