Multiscale structure and evolution of hurricane earl (2010) during rapid intensification

Robert F. Rogers, Paul D. Reasor, Jun A. Zhang

Research output: Contribution to journalArticlepeer-review

130 Scopus citations

Abstract

The structure and evolution of Hurricane Earl (2010) during its rapid intensification as sampled by aircraft is studied here. Rapid intensification occurs in two stages. During the early stage, covering ~24 h, Earl was a tropical storm experiencing moderate northeasterly shear with an asymmetric distribution of convection, and the symmetric structure was shallow, broad, and diffuse. The upper-level circulation center was significantly displaced from the lower-level circulation at the beginning of this stage. Deep, vigorous convection-termed convective bursts-was located on the east side of the storm and appeared to play a role in positioning the upper-level cyclonic circulation center above the low-level center.By the end of this stage the vortex was aligned and extended over a deep layer, and rapid intensification began. During the late stage, rapid intensification continued as Earl intensified ~20ms-1 during the next 24 h. The vortex remained aligned in the presence of weaker vertical shear, although azimuthal asymmetries persisted that were characteristic of vortices in shear. Convective bursts concentrated near the radius ofmaximumwinds,with themajority located inside the radius of maximum winds. Each of the two stages described here raises questions about the role of convective- and vortex-scale processes in rapid intensification.During the early stage, the focus is on the role of convective bursts and their associated mesoscale convective system on vortex alignment and the onset of rapid intensification. During the late stage, the focus is on the processes that explain the observed radial distribution of convective bursts that peak inside the radius of maximum winds.

Original languageEnglish (US)
Pages (from-to)536-562
Number of pages27
JournalMonthly Weather Review
Volume143
Issue number2
DOIs
StatePublished - 2015

ASJC Scopus subject areas

  • Atmospheric Science

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