The Dependence of Numerically Simulated Cyclic Mesocyclogenesis upon Environmental Vertical Wind Shear

Adlerman, Edwin J.; Droegemeier, Kelvin K.
December 2005
Monthly Weather Review;Dec2005, Vol. 133 Issue 12, p3595
Academic Journal
Building upon the authors’ previous work that examined the dynamics of numerically simulated cyclic mesocyclogenesis and its dependence upon model physical and computational parameters, this study likewise uses idealized numerical simulations to investigate associated dependencies upon ambient vertical wind shear. Specifically, the authors examine variations in hodograph shape, shear magnitude, and shear distribution, leading to storms with behavior ranging from steady state to varying degrees of aperiodic occluding cyclic mesocyclogenesis. However, the authors also demonstrate that a different mode of nonoccluding cyclic mesocyclogenesis may occur in certain environments. Straight hodographs (unidirectional shear) produce only nonoccluding cyclic mesocyclogenesis. Introducing some curvature by adding a quarter circle of turning at low levels results in steady, nonoccluding, and occluding modes. When a higher degree of curvature is introduced—for example, turning through half and three-quarter circles—the tendency for nonoccluding behavior is diminished. None of the full-circle hodographs exhibited cycling during 4 h of simulation. Overall, within a given storm, the preferred mode of cycling is related principally to hodograph shape and magnitude of the ambient vertical shear.


Related Articles

  • On the Classification of Vertical Wind Shear as Directional Shear versus Speed Shear. Markowski, Paul; Richardson, Yvette // Weather & Forecasting;Apr2006, Vol. 21 Issue 2, p242 

    Vertical wind shear is commonly classified as “directional” or “speed” shear. In this note, these classifications are reviewed and their relevance discussed with respect to the dynamics of convective storms. In the absence of surface drag, storm morphology and evolution...

  • The Interaction of Numerically Simulated Supercells Initiated along Lines. Bluestein, Howard B.; Weisman, Morris L. // Monthly Weather Review;Sep2000, Vol. 128 Issue 9, p3128 

    Supercells in the southern plains are often localized, forming as cells along a convective line, even though the environment may support supercell formation over a much broader, mesoscale region. A set of numerical experiments is devised in which it is demonstrated that the evolution of...

  • Structure of Highly Sheared Tropical Storm Chantal during CAMEX-4. Heymsfield, G. M.; Halverson, J.; Ritchie, E.; Simpson, Joanne; Molinari, J.; Tian, L. // Journal of the Atmospheric Sciences;Jan2006, Vol. 63 Issue 1, p268 

    Tropical Storm Chantal during August 2001 was a storm that failed to intensify over the few days prior to making landfall on the Yucatan Peninsula. An observational study of Tropical Storm Chantal is presented using a diverse dataset including remote and in situ measurements from the NASA ER-2...

  • A Sensitivity Study of Hodograph-Based Methods for Estimating Supercell Motion. Ramsay, Hamish A.; Doswell III, Charles A. // Weather & Forecasting;Dec2005, Vol. 20 Issue 6, p954 

    Four supercell motion forecast algorithms are investigated with respect to their hodograph-analysis parameters. Another method derived from the data presented herein, the so-called offset method, is used to develop a baseline standard for the aforementioned schemes, using the observed storm...

  • Simple kinematic models for the environmental interaction of tropical cyclones in vertical wind shear. Riemer, M.; Montgomery, M. T. // Atmospheric Chemistry & Physics;2011, Vol. 11 Issue 17, p9395 

    A major impediment to the intensity forecast of tropical cyclones (TCs) is believed to be associated with the interaction of TCs with dry environmental air. However, the conditions under which pronounced TC-environment interaction takes place are not well understood. As a step towards improving...

  • Large-Scale Flow Patterns and Their Influence on the Intensification Rates of Western North Pacific Tropical Storms. Ventham, Justin D.; Wang, Bin // Monthly Weather Review;Mar2007, Vol. 135 Issue 3, p1110 

    NCEP–NCAR reanalysis data are used to identify large-scale environmental flow patterns around western North Pacific tropical storms with the goal of finding a signal for those most favorable for rapid intensification, based on the hypothesis that aspects of the horizontal flow influence...

  • Observed Rainfall Asymmetry in Tropical Cyclones Making Landfall over China. Yu, Zifeng; Wang, Yuqing; Xu, Haiming // Journal of Applied Meteorology & Climatology;Jan2015, Vol. 54 Issue 1, p117 

    In this study, the rainfall asymmetries in tropical cyclones (TCs) that made landfall in the Hainan (HN), Guangdong (GD), Fujian (FJ), and Zhejiang (ZJ) provinces of mainland China and Taiwan (TW) from 2001 to 2009 were analyzed on the basis of TRMM satellite 3B42 rainfall estimates. The results...

  • Environmental influences on the intensity changes of tropical cyclones over the Western North Pacific. Shoujuan Shu; Fuqing Zhang; Jie Ming; Yuan Wang // Atmospheric Chemistry & Physics Discussions;2013, Vol. 13 Issue 12, p31815 

    The influence of environmental conditions on the intensity changes of tropical cyclones (TCs) over the western North Pacific (WNP) is investigated through examination of 37 TCs during 2000-2011 that interacted directly with the western North Pacific subtropical high (WNPSH). Comprehensive...

  • Midlevel Ventilation’s Constraint on Tropical Cyclone Intensity. Tang, Brian; Emanuel, Kerry // Journal of the Atmospheric Sciences;Jun2010, Vol. 67 Issue 6, p1817 

    Midlevel ventilation, or the flux of low-entropy air into the inner core of a tropical cyclone (TC), is a hypothesized mechanism by which environmental vertical wind shear can constrain a tropical cyclone’s intensity. An idealized framework based on steadiness, axisymmetry, and slantwise...


Read the Article

Courtesy of

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

Try another library?
Sign out of this library

Other Topics