Understanding the basic structure and development of extratropical cyclones is still quite important in modern meteorology. For this purpose a simple analytical model has been developed that is qualitative as well as quantitative and also reveals modern concepts like the frontal fracture and conveyor belts. The model solution can be derived from the quasi-geostrophic equations of the two-layer model with a few addditional assumptions.
In memorian of L.C. Heijboer, deceased January 1994.
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