Modification of misovortices during landfall in the Japan Sea coastal region

Kato, Ryohei; Kusunoki, Kenichi; Inoue, Hanako; Arai, Ken-ichiro; Nishihashi, Masahide; Fujiwara, Chusei; Shimose, Ken-ichi; Mashiko, Wataru; Satô, Eiichi; Saito, Sadao; Hayashi, Syugo; Yoshida, Shigeaki; Suzuki, Hiroto

doi:10.1016/j.atmosres.2015.01.024

Cited by 6 publications

(11 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As the vortex moved further inland (after 0409:57 LST), its low-level vortex structure started to lean downshear. This is consistent with previous observational studies that have reported an increase in forward tilt with height after making landfall (Kato et al 2015). Structural changes of the low-level snowband during vortex development are displayed in the reflectivity field observed around vortex 4 (Fig.…”

Section: A Surface In-situ Observations Of the Vortexsupporting

confidence: 81%

“…In contrast, the low-level vortex exhibited a contraction of the vortex core diameter and an increase in both the peak tangential velocity and vertical vorticity during a landfall, which is a more rapid change than the decay of the upper part. These findings, especially on the temporal evolutions of the low-level vortex, are markedly different from previous studies (e.g., Kusunoki et al 2011;Inoue et al 2011;Kato et al 2015). Inoue et al (2011) and Kato et al (2015) demonstrated that the peak tangential velocity clearly decreased (not increased) during the landfall.…”

Section: Discussioncontrasting

confidence: 56%

“…These findings, especially on the temporal evolutions of the low-level vortex, are markedly different from previous studies (e.g., Kusunoki et al 2011;Inoue et al 2011;Kato et al 2015). Inoue et al (2011) and Kato et al (2015) demonstrated that the peak tangential velocity clearly decreased (not increased) during the landfall. Kusunoki et al (2011) reported shrinkage of low-level vortex without a signature of a coeval increase in peak tangential velocity.…”

Section: Discussioncontrasting

confidence: 56%

“…The peak tangential velocity and the vertical vorticity of the vortex increased coevally with this low-level contraction. Given that such an increase in peak tangential velocity and vertical vorticity during a landfall as observed during this event is remarkably different from the decrease in peak tangential velocity reported in Kato et al (2015), we investigated the time-dependent changes of the low-level wind field around the vortex and the parent storm behavior in order to discern the mechanisms responsible. Figure 11 shows the horizontal wind vectors relative to vortex 4, the divergence, and the vertical vorticity field pattern derived from dual-Doppler analysis.…”

Section: A Surface In-situ Observations Of the Vortexmentioning

confidence: 99%

“…Their data also indicated that the vertical vorticities at low altitudes rapidly intensified after the landfall, although the detailed temporal evolution of the vortex during this period was not discussed. Recently, Kato et al (2015) used volume-scan data to investigate temporal changes in the intensity and structure of misovortices during a landfall in the Japan Sea coastal region and showed that vortices weakened after making the landfall, while additionally increasing their forward tilt with increasing height. Although surface roughness was suggested to be a possible cause of this post-landfall vortex decay, other factors that would affect their behavior were not discussed (e.g., parent storm behavior, modification of low-level wind fields, and interaction with land breeze).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Structure and Evolution of Misovortices Observed within a Convective Snowband in the Japan Sea Coastal Region during a Cold-Air Outbreak on 31 December 2007

Inoue¹,

Kusunoki²,

Arai³

et al. 2016

Journal of the Meteorological Society of Japan

Self Cite

View full text Add to dashboard Cite

Cyclonic misovortices with a horizontal scale of 0.4 -1.9 km embedded within a convective snowband were observed by two X-band Doppler radars in the Japan Sea coastal region on December 31, 2007, during a cold-air outbreak. All vortices initially developed offshore, subsequently making a landfall. The structure and temporal evolution of these vortices during the landfall were investigated using high-resolution data obtained from two X-band Doppler radars.The studied vortices developed along a low-level convergence line characterized by cyclonic horizontal shear, suggesting that horizontal shearing instability was responsible for the initial development of the vortices. A detailed investigation was performed on a vortex that passed within a close range (< 10 km) of both radars and almost directly over two surface observation stations. As this vortex approached the coast, it extended upward with time and eventually reached a height greater than half of the echo-top height of the parent snowband. During the landfall, the vortex core diameter contracted markedly and its peak tangential velocity and vertical vorticity increased at lower altitudes. Such a temporal change of low-level vortex was associated with an intensification of low-level convergence around the vortex and the convergence line. These facts suggest that the stretching of the low-level vortex was responsible for the low-level vortex contraction and increase in peak tangential velocity and vertical vorticity during the landfall.

show abstract

Section: A Surface In-situ Observations Of the Vortexsupporting

confidence: 81%

Section: Discussioncontrasting

confidence: 56%

Section: Discussioncontrasting

confidence: 56%

Section: A Surface In-situ Observations Of the Vortexmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Structure and Evolution of Misovortices Observed within a Convective Snowband in the Japan Sea Coastal Region during a Cold-Air Outbreak on 31 December 2007

Inoue¹,

Kusunoki²,

Arai³

et al. 2016

Journal of the Meteorological Society of Japan

Self Cite

View full text Add to dashboard Cite

show abstract

Analysis of the horizontal two‐dimensional near‐surface structure of a winter tornadic vortex using high‐resolution in situ wind and pressure measurements

Kato

Kusunoki²,

Satô³

et al. 2015

JGR Atmospheres

Self Cite

View full text Add to dashboard Cite

The horizontal two-dimensional near-surface structure of a tornadic vortex within a winter storm was analyzed. The tornadic vortex was observed on 10 December 2012 by the high-resolution in situ observational linear array of wind and pressure sensors (LAWPS) system in conjunction with a high-resolution Doppler radar. The 0.1 s maximum wind speed and pressure deficit near the ground were recorded as 35.3 m s À1 and À3.8 hPa, respectively. The horizontal two-dimensional distributions of the tornadic vortex wind and pressure were retrieved by the LAWPS data, which provided unprecedented observational detail on the following important features of the near-surface structure of the tornadic vortex. Asymmetric convergent inflow toward the vortex center existed. Total wind speed was strong to the right and rear side of the translational direction of the vortex and weak in the forward part of the vortex possibly because of the strong convergent inflow in that region. The tangential wind speed profile of the vortex was better approximated using a modified Rankine vortex rather than the Rankine vortex both at 5 m above ground level (agl) and 100 m agl, and other vortex models (Burgers-Rott vortex and Wood-White vortex) were also compared. The cyclostrophic wind balance was violated in the core radius R 0 and outside the core radius in the forward sector; however, it was held with a relatively high accuracy of approximately 14% outside the core of the vortex in the rearward sector (from 2 R 0 to 5 R 0 ) near the ground.

show abstract

Waterspouts: A Review

Miglietta¹

2019

Reference Module in Earth Systems and Environmental Sciences

View full text Add to dashboard Cite

Modification of misovortices during landfall in the Japan Sea coastal region

Cited by 6 publications

References 25 publications

Structure and Evolution of Misovortices Observed within a Convective Snowband in the Japan Sea Coastal Region during a Cold-Air Outbreak on 31 December 2007

Structure and Evolution of Misovortices Observed within a Convective Snowband in the Japan Sea Coastal Region during a Cold-Air Outbreak on 31 December 2007

Analysis of the horizontal two‐dimensional near‐surface structure of a winter tornadic vortex using high‐resolution in situ wind and pressure measurements

Waterspouts: A Review

Contact Info

Product

Resources

About