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col


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The point on a weather map that lies between two depressions and two anticyclones, arranged alternately. The pressure distribution may be envisaged as the intersection of a trough with a ridge, in a saddle-shaped region. When the two high-pressure regions are closer together than the low-pressure areas, the situation is described as an anticyclonic col, and when the low-pressure regions are closer, a cyclonic col. The slightest change in the pressure pattern may cause a substantial alteration in the position of a col, which therefore tends to be a transitory feature.

Col A typical col, with an approximately symmetrical arrangement of high- and low-pressure areas, and here crossed by a weak front.

Subjects: Meteorology and Climatology.


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