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Original Research Papers

A numerical, high-resolution study of the life cycle of the severe storm over Denmark on 3 December 1999

Authors:

Niels Woetmann Nielsen ,

Danish Meteorological Institute, Lyngbyvej 100, DK2100 Copenhagen Ø, DK
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Benthansen Sass

Danish Meteorological Institute, Lyngbyvej 100, DK2100 Copenhagen Ø, DK
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Abstract

A severe cyclone with destructive effects moved across Denmark during the evening of 3 December 1999. A study, based on a numerical high-resolution limited area model simulation of this event, is presented. The development is of the frontal wave type. It can be interpreted qualitatively as an interaction between a PV wave at the tropopause, a surface temperature wave on the polar front and a low-level positive and upper-level negative PV anomaly generated by release of latent heat of condensation. In a run without this heat source the minimum sea level pressure in the cyclone increased from 954 to 978 hPa. As a result of the PV anomaly interactions the surface cyclone moves from the anticyclonic to the cyclonic shear side of the upper-level jet during its evolution from an incipient low to a mature cyclone. Its frontal structure evolves from an anticyclonic barotropic shear type to a barotropic type without shear. In the former state a low-level jet is confined to the warm sector ofthe surface cyclone. In the latter state a low-level bent-back front jet develops and becomes the most intense low-level jet. The time-scale from initiation to maximum intensity of the jet is about 9 h. The run without latent heat release develops similar, but weaker frontal structures, most notably a much weaker bent-back front.

How to Cite: Nielsen, N.W. and Sass, B., 2003. A numerical, high-resolution study of the life cycle of the severe storm over Denmark on 3 December 1999. Tellus A: Dynamic Meteorology and Oceanography, 55(4), pp.338–351. DOI: http://doi.org/10.3402/tellusa.v55i4.12100
  Published on 01 Jan 2003
 Accepted on 11 Feb 2003            Submitted on 4 Feb 2002

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