Vortex Interactions and Barotropic Aspects of Concentric Eyewall Formation

Hung-Chi Kuo; Schubert, Wayne H.; Chia-Ling Tsai; Yu-Fen Kuo
December 2008
Monthly Weather Review;Dec2008, Vol. 136 Issue 12, p5183
Academic Journal
Concentric eyewall formation can be idealized as the interaction of a tropical cyclone core with nearby weaker vorticity of various spatial scales. This paper considers barotropic aspects of concentric eyewall formation from modified Rankine vortices. In this framework, the following parameters are found to be important in concentric eyewall formation: vorticity strength ratio, separation distance, companion vortex size, and core vortex skirt parameter. A vorticity skirt on the core vortex affects the filamentation dynamics in two important ways. First, the vorticity skirt lengthens the filamentation time, and therefore slows moat formation in the region just outside the radius of maximum wind. Second, at large radii, a skirted core vortex induces higher strain rates than a corresponding Rankine vortex and is thus more capable of straining out the vorticity field far from the core. Calculations suggest that concentric structures result from binary interactions when the small vortex is at least 4–6 times as strong as the larger companion vortex. An additional requirement is that the separation distance between the edges of the two vortices be less than 6–7 times the smaller vortex radius. Broad moats form when the initial companion vortex is small, the vorticity skirt outside the radius of maximum wind is small, and the strength ratio is large. In concentric cases, an outer vorticity ring develops when the initial companion vortex is large, the vorticity skirt outside the radius of maximum wind is small, and the strength ratio is not too large. In general, when the companion vortex is 3 times as strong as the core vortex and the separation distance is 4–6 times the radius of the smaller vortex, a core vortex with a vorticity skirt produces concentric structures. In contrast, a Rankine vortex produces elastic interaction in this region of parameter space. Thus, a Rankine vortex of sufficient strength favors the formation of a concentric structure closer to the core vortex, while a skirted vortex of sufficient strength favors the formation of concentric structures farther from the core vortex. This may explain satellite microwave observations that suggest a wide range of radii for concentric eyewalls.


Related Articles

  • Estimates of tropical cyclone geometry parameters based on best track data. Nederhoff, Kees; Giardino, Alessio; van Ormondt, Maarten; Vatvani, Deepak // Natural Hazards & Earth System Sciences Discussions;2019, p1 

    Parametric wind profiles are commonly applied in a number of engineering applications for the generation of tropical cyclone (TC) wind and pressure fields. Nevertheless, existing formulations for computing wind fields often lack the required accuracy when the TC geometry is not known. This may...

  • Comments on “Reexamination of Tropical Cyclone Wind–Pressure Relationship”. Veterasamy, Shyamnath // Weather & Forecasting;Aug2008, Vol. 23 Issue 4, p758 

    In their study on the wind–pressure relationship (WPR) that exists in tropical cyclones, Knaff and Zehr presented results of the use of the Dvorak Atlantic WPR for estimating central pressure and maximum wind speed of tropical cyclones. These show some fairly large departures of estimated...

  • TOWARAD HOMOGENGUS GLOBAL TROPICAL CYCLONE BEST-TRACK DATASET. Levinson, David H.; Diamond, Howard J.; Knapp, Kenneth R.; Kruk, Michael C.; Gibney, Ethan J. // Bulletin of the American Meteorological Society;Mar2010, Vol. 91 Issue 3, p377 

    Information about several reports discussed at the International Best Track Archive for Climate Stewardship (IBTraCS) workshop is presented. Topics include the operational procedures towards producing tropical cyclone best-track data at various agencies, wind pressure relationships and wind...

  • Impact of Different Types of ENSO Years on Intensity Changes of Landfalling Tropical Cyclones over China. Liu, Lu // Atmosphere;Mar2019, Vol. 10 Issue 3, p161 

    This study examines whether there are significant differences in intensity and destructiveness of landfalling tropical cyclones (TCs) over China in central Pacific warm (CPW), eastern Pacific warm (EPW) and La Niña (LA) years. By analyzing different seasons and locations of TCs making...

  • Control Parameters for the Influence of a Mesoscale Mountain Range on Cyclone Track Continuity and Deflection. Lin, Yuh-Lang; Chen, Shu-Yun; Hill, Christopher M.; Huang, Ching-Yuang // Journal of the Atmospheric Sciences;6/1/2005, Vol. 62 Issue 6, p1849 

    In this study prospective control parameters are identified for diagnosing the continuity and deflection of cyclone tracks across a mesoscale mountain range. Based on idealized simulations of a westward-moving cyclone, it was found that the cyclone track becomes a discontinuous (continuous)...

  • Numerical investigation of the effect of winglets on the evolution of an aircraft vortex wake. Voevodin, A. // Fluid Dynamics;Sep2008, Vol. 43 Issue 5, p725 

    The effect of winglets on the aerodynamic characteristics of a heavy aircraft and the parameters of the vortex wake behind it is investigated for the landing regime. The solution of the complete problem is obtained by breaking up the wake into three regions, namely, the near, intermediate, and...

  • Evaluation of the National Hurricane Center’s Tropical Cyclone Wind Speed Probability Forecast Product. Splitt, Michael E.; Shafer, Jaclyn A.; Lazarus, Steven M.; Roeder, William P. // Weather & Forecasting;Apr2010, Vol. 25 Issue 2, p511 

    A tropical cyclone (TC) wind speed probability forecast product developed at the Cooperative Institute for Research in the Atmosphere (CIRA) and adopted by the National Hurricane Center (NHC) is evaluated for U.S. land-threatening and landfalling events over four hurricane seasons from 2004 to...

  • Ground-Based Velocity Track Display (GBVTD) Analysis of W-Band Doppler Radar Data in a Tornado near Stockton, Kansas, on 15 May 1999. Tanamachi, Robin L.; Bluestein, Howard B.; Lee, Wen-Chau; Bell, Michael; Pazmany, Andrew // Monthly Weather Review;Mar2007, Vol. 135 Issue 3, p783 

    On 15 May 1999, a storm intercept team from the University of Oklahoma collected high-resolution, W-band Doppler radar data in a tornado near Stockton, Kansas. Thirty-five sector scans were obtained over a period of approximately 10 min, capturing the tornado life cycle from just after...

  • Climatic parameters of wind-field variability in the Black Sea region: Numerical reanalysis of regional atmospheric circulation. Efimov, V. V.; Anisimov, A. E. // Izvestiya, Atmospheric & Oceanic Physics;Jun2011, Vol. 47 Issue 3, p350 

    reanalysis of atmospheric circulation in the Black Sea region is performed with a high spatial resolution of 25 × 25 km for the period from 1958 to 2001. Climatic wind speed fields are estimated, as are their spatial structure and seasonal variability. Mesoscale regions of cyclonic and...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics