Interpretation of Mesocyclone Vorticity and Divergence Structure from Single-Doppler Radar

Desrochers, Paul R.; Harris, Fran

doi:10.1175/1520-0450(1996)035<2191:iomvad>2.0.co;2

Cited by 7 publications

(4 citation statements)

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“…We note here that the Doppler velocity field of a vortex is generally distorted at short range (Wood and Brown 1992) and, therefore, the estimated core diameter is possibly underestimated by 10−20% at 0755−0758 JST. Based on a simple circular vortex assumption (Desrochers and Harris 1996), we calculate the rotational velocity v rot,sngl and the vertical vorticity ζ sngl by using the following equations,…”

Section: Observation and Datamentioning

confidence: 70%

Rapid Volumetric Growth of Misocyclone and Vault-Like Structure in Horizontal Shear Observed by Phased Array Weather Radar

Adachi

Kusunoki

Yoshida

et al. 2016

SOLA

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The present paper reports a sub-minute scale growth of a misocyclone and vault-like structure in a horizontal shear environment observed by a phased array weather radar (PAWR). Between 0756 and 0801 Japan Standard Time on 25 August 2013, dual radar synthesis shows a signature of significant low-level convergence at 0.6−0.8 km above sea level (ASL). PAWR data show a coincident rapid growth of a misocyclone with top altitude increasing from 1.2 to 1.8 km ASL in two minutes. A small vaultlike structure with the maximum height of 1.3 km is formed following to the development of misocyclone with a delay time of about two minutes. One possible explanation is the role of vorticity stretching associated with horizontal shear instability. Fast and volumetric seamless observation of such a small spatiotemporal-scale phenomena opens up a way to progress our understanding of misocyclone that is of importance for convection initiation and severe weather phenomena.(Citation: Adachi, T., K. Kusunoki, S. Yoshida, H. Inoue, K. Arai, and T. Ushio, 2016: Rapid volumetric growth of misocyclone and vault-like structure in horizontal shear observed by phased array weather radar. SOLA, 12, 314−319,

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Section: Observation and Datamentioning

confidence: 70%

Rapid Volumetric Growth of Misocyclone and Vault-Like Structure in Horizontal Shear Observed by Phased Array Weather Radar

Adachi

Kusunoki

Yoshida

et al. 2016

SOLA

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“…It is also possible that another physical mechanism beyond those proposed in this study is responsible for the case study documented in Bluestein et al (2003b). For example, quasi, non-rotating, elliptical circulations have also been revealed in both observational and modeling studies; however, unlike the elliptical circulations considered in this study, the circulation center was not located at the geometric center of the ellipse (e.g., Moss and Jones 1978;Brandes 1984;Bluestein and Hazen 1989;Desrochers and Harris 1996). The authors are also aware of a similar situation documented in Shapiro (1983) where a numerically simulated TC possessed a wavenumber two structure in the boundary layer produced by the interactions between the TC circulation and surface friction effects.…”

Section: Discussionmentioning

confidence: 99%

Doppler Velocity Signatures of Idealized Elliptical Vortices

Lee¹,

Harasti²,

Bell³

et al. 2006

Terr. Atmos. Ocean. Sci.

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TAO, Vol. 17, No. 2, June 2006 430 can be seen that when the phase of the wavenumber two V T is ahead of V R by π/4 with same amplitude, GBVTD coefficients A3 and B3 are near zero; hence, GBVTD technique cannot retrieve the wavenumber two amplitude in these conditions. However, by knowing the elliptical shape of the vortex as a priori these two mechanisms can still be distinguished by the characteristics of the corresponding GBVTD coefficients.

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“…Here V max and V min are the maximum outbound and inbound radial velocities, respectively, and θ is the angular offset between the radial positions of V max and V min . Note that θ = 0 if V max and V min are located the same distance from the measuring radar (Desrochers and Harris 1996). The use of θ includes only the rotational (tangential) component of flow in the calculation of V ROT and excludes any convergent (radial) component.…”

Section: Methodsmentioning

confidence: 99%

Analysis of Mesovortex Characteristics, Behavior, and Interactions during the Second 30 June-1 July 2014 Midwestern Derecho Event

Lyza

Clayton

Knupp

et al. 2021

EJSSM

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A pair of intense, derecho-producing quasi-linear convective systems (QLCSs) impacted northern Illinois and northern Indiana during the evening hours of 30 June through the predawn hours of 1 July 2014. The second QLCS trailed the first one by only 250 km and approximately 3 h, yet produced 29 confirmed tornadoes and numerous areas of nontornadic wind damage estimated to be caused by 30‒40 m s‒1 flow. Much of the damage from the second QLCS was associated with a series of 38 mesovortices, with up to 15 mesovortices ongoing simultaneously. Many complex behaviors were documented in the mesovortices, including: a binary (Fujiwhara) interaction, the splitting of a large mesovortex in two followed by prolific tornado production, cyclic mesovortexgenesis in the remains of a large mesovortex, and a satellite interaction of three small mesovortices around a larger parent mesovortex. A detailed radar analysis indicates no definitive differences between tornadic and nontornadic mesovortices. All observed mesovortices were cyclonic, indicating that either the vertical tilting of streamwise vorticity, generation of vortices via the release of horizontal shearing instability, or both were involved in mesovortex genesis. This paper examines the environment ahead of the second QLCS, the characteristics of the mesovortices produced, and the aforementioned complex interactions. It also discusses implications for mesovortex genesis and dynamics as well as operational considerations.

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Interpretation of Mesocyclone Vorticity and Divergence Structure from Single-Doppler Radar

Cited by 7 publications

References 0 publications

Rapid Volumetric Growth of Misocyclone and Vault-Like Structure in Horizontal Shear Observed by Phased Array Weather Radar

Rapid Volumetric Growth of Misocyclone and Vault-Like Structure in Horizontal Shear Observed by Phased Array Weather Radar

Doppler Velocity Signatures of Idealized Elliptical Vortices

Analysis of Mesovortex Characteristics, Behavior, and Interactions during the Second 30 June-1 July 2014 Midwestern Derecho Event

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