1 - The introductory module

• Justification of the ANASYG/PRESYG concept

  • synoptic context, upper level dynamics, crucial at mid-latitudes
  • deficiency of the present surface charts.
    • example : 4 successivesynoptic surface analysis ;(every 6h).
      note the difficulty to under-stand the evolution becauseof the changes in the drawing of the systems : upper cold front > cold front > occlusion > cold front ; the problem is : how to draw what happens in the cold air? 

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