Jet Stream

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Jet Stream
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250 mb isotach
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Main Upper Tropospheric Jets Closely Associated
with the Tropopause
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Tropopause
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Tropospause Heights

• Tropopause height changes rapidly at subtropical
  and polar jets
• Higher in ridges and lower in troughs

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Tropopause Heighthttp//weather.ou.edu/scavallo
/images/real_time/trop_pressure/trop_pressure.html
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Subtropical Jet Stream
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Subtropical Jet Stream Often Associated with a
cloud band
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• http//itg1.meteor.wisc.edu/wxwise/AckermanKnox/ch
  ap7/subtropical_jet.html

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Jet Streams Relationship to Temperature Can Be
Shown through Thermal Wind Arguments
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250 mb isotach
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1000-500 mb thickness-large thickness gradient
and thus thermal wind near jet core
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Or alternatively
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The Jet Stream
Recall the horizontal temperature effects on the
pressure
500 mb
700 mb
850 mb
Psurface
Warm
Cold
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The Jet Stream
Consider the balance of forces at each level
Co
PGF
500 mb
700 mb
850 mb
Ps
Warm
Cold
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Other Jets
African Easterly Jet
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Sierra Nevada Barrier Jet
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There are a variety of jet stream configurations
that are well-known
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