A Comparison of Extended and Quasigeostrophic Dynamics for a Case of Small–Rossby Number Extratropical Cyclone Development

James M. Vasilj Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana

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Phillip J. Smith Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana

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Abstract

This note compares the extended (EXT) and quasigeostrophic (QG) dynamics of a small–Rossby number extratropical cyclone using the Zwack–Okossi (ZO) equation. Applied to a cyclone that occurred on 8–9 November 1985 over the North Atlantic Ocean, results show that although differences exist, both the EXT and QG forms of the ZO equation provide very adequate estimates of the large-scale forcing processes associated with this case.

* Current affiliation: American Airlines, Fort Worth, Texas.

Corresponding author address: Dr. Phillip J. Smith, Department of Earth and Atmospheric Sciences, Purdue University, 1397 Civil Engineering Building, West Lafayette, IN 47907-1397.

Email: smith@meteor.atms.purdue.edu

Abstract

This note compares the extended (EXT) and quasigeostrophic (QG) dynamics of a small–Rossby number extratropical cyclone using the Zwack–Okossi (ZO) equation. Applied to a cyclone that occurred on 8–9 November 1985 over the North Atlantic Ocean, results show that although differences exist, both the EXT and QG forms of the ZO equation provide very adequate estimates of the large-scale forcing processes associated with this case.

* Current affiliation: American Airlines, Fort Worth, Texas.

Corresponding author address: Dr. Phillip J. Smith, Department of Earth and Atmospheric Sciences, Purdue University, 1397 Civil Engineering Building, West Lafayette, IN 47907-1397.

Email: smith@meteor.atms.purdue.edu

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