MidLatitude Cyclone

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Mid-Latitude Cyclone

• Dynamic Low Pressure
• Transforming Potential to Kinetic Energy

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Fig. 12-CO, p. 308
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Overview

• Air Mass Development
• Stationary Front
• Development of a Low Pressure System
• Evolution of Frontal Systems
• Life Cycle
• Conversion of Energy
• Relation to Upper Level

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Air Masses

• Likely Conflict of cP and mT
• cP moves southward out of source region
• Development of Stationary Front
• Large Concentration of Potential Energy

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Fig. 12-5b, p. 313
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Development of Low Pressure System

• Stationary Front is an Area of Slightly Lower
  Pressure
• Perturbation center for low pressure
  development
• Deepening pressure is dropping low pressure
  is Intensifying

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Fig. 12-4, p. 313
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Fig. 12-5a, p. 313
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Evolution of Frontal Systems

• Low Pressure Circulation Begins to Develop
• Counter- clockwise motion begins to move the
  Stationary Front
• To the West of the Low Cold Air Pushing into
  Warm (Cold Front)
• The the East of the Low Warm Air Pushing into
  Cold (Warm front)

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Fig. 12-1, p. 311
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Cyclone Life Cycle

• Successive Phase of Evolution and Intensity
• Conversion of Potential Energy into Kinetic
  Energy
• Stages of Life Cycle
• Birth, Imature, Mature, Dissipating

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Fig. 12-1, p. 311
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Fig. 12-18, p. 325
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Types Location of Weather
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Fig. 12-13, p. 323
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Fig. 12-16, p. 324
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Fig. 1, p. 314
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Fig. 12-15, p. 324
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Upper Level Support

• Dines Compensation Relation of Surface
  Pressure Systems to Upper Level
• Convergence Divergence
• Upper Level Flow Patterns and Air Masses

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Fig. 3, p. 317
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Fig. 12-6, p. 315
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Fig. 12-10, p. 319
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Fig. 12-7, p. 315
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Fig. 12-12, p. 322
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Fig. 12-8, p. 318
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Cyclone Families
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Fig. 12-2, p. 312
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Fig. 12-3, p. 312
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Fig. 12-25, p. 330