Editorial Type:
Article
Article Type:
Research Article

Prediction and Diagnosis of the Motion and Rapid Intensification of Typhoon Sinlaku during Tropical Cyclone Structure Experiment 2008 (TCS08)

Marie-Dominique Leroux Centre for Australian Weather and Climate Research, Bureau of Meteorology, Melbourne, Australia, and Laboratoire de l’Atmosphère et des Cyclones, Unité mixte CNRS–Météo-France–Université de La Réunion, La Réunion, France

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Noel E. Davidson Centre for Australian Weather and Climate Research, Bureau of Meteorology, Melbourne, Australia

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Yimin Ma Centre for Australian Weather and Climate Research, Bureau of Meteorology, Melbourne, Australia

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Jeffrey D. Kepert Centre for Australian Weather and Climate Research, Bureau of Meteorology, Melbourne, Australia

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Print Publication:
01 May 2013
DOI:
https://doi.org/10.1175/MWR-D-11-00346.1
Page(s):
1413–1436
Restricted access

Abstract

The impact of initial structure on storm evolution is examined for the case of a tropical storm entering rapid intensification. At the onset of rapid intensification, satellite cloud signatures suggest that the structural organization of Typhoon Sinlaku (2008) was dominated by a primary band of convection present at outer radii. The development of the eyewall subsequently occurred within this band of deep convection.

Numerical forecasts of Sinlaku are initialized at 15- and 5-km resolution using a broad range of vortex scales, at a time when the storm was still weak and its structure not clearly defined. Evidence is presented that beta propagation played a key role in changing the storm’s motion under weak environmental steering. It is found that the track forecast improves over the period when beta propagation is prominent if the vortex is initialized with a large radius of maximum wind (RMW), corresponding with the primary outer cloud band. The initial vortex structure is also suggested to play a critical role in the pathway to rapid intensification, and in the formation of the eyewall for the defined environmental forcing. With an initially large RMW, the forecast captures the evolution of structure and intensity more skillfully. Eyewall formation inside the primary outer convective band for the weak storm is illustrated and some possible dynamical interpretations are discussed.

Corresponding author address: Marie-Dominique Leroux, Météo-France DIRRE, Cellule Recherche Cyclones, BP4, 97491 Ste Clotilde, La Réunion, France. E-mail: marie-dominique.leroux@meteo.fr

Abstract

The impact of initial structure on storm evolution is examined for the case of a tropical storm entering rapid intensification. At the onset of rapid intensification, satellite cloud signatures suggest that the structural organization of Typhoon Sinlaku (2008) was dominated by a primary band of convection present at outer radii. The development of the eyewall subsequently occurred within this band of deep convection.

Numerical forecasts of Sinlaku are initialized at 15- and 5-km resolution using a broad range of vortex scales, at a time when the storm was still weak and its structure not clearly defined. Evidence is presented that beta propagation played a key role in changing the storm’s motion under weak environmental steering. It is found that the track forecast improves over the period when beta propagation is prominent if the vortex is initialized with a large radius of maximum wind (RMW), corresponding with the primary outer cloud band. The initial vortex structure is also suggested to play a critical role in the pathway to rapid intensification, and in the formation of the eyewall for the defined environmental forcing. With an initially large RMW, the forecast captures the evolution of structure and intensity more skillfully. Eyewall formation inside the primary outer convective band for the weak storm is illustrated and some possible dynamical interpretations are discussed.

Corresponding author address: Marie-Dominique Leroux, Météo-France DIRRE, Cellule Recherche Cyclones, BP4, 97491 Ste Clotilde, La Réunion, France. E-mail: marie-dominique.leroux@meteo.fr
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