- 著者
- Kenichi Kusunoki Ken-ichiro Arai Hanako Y. Inoue Chusei Fujiwara
- 出版者
- Meteorological Society of Japan
- 雑誌
- SOLA (ISSN:13496476)
- 巻号頁・発行日
- vol.15, pp.234-237, 2019 (Released:2019-11-15)
- 参考文献数
- 23
On 11 December 2012, a wind gust caused an F0-intensity wind damage in the Shonai area, Yamagata Prefecture, Japan. This paper provides an overview of an anticyclonic misocyclone (i.e., anticyclonic circulation in the Doppler velocity) related to a wind gust from X-band Doppler radar data. The anticyclonic misocyclone was embedded within a cell with a spiral echo diameter of approximately 3-4 km. The misocyclone over the Sea of Japan moved southeastward at a speed of 11 m s−1, made landfall, and passed over the damaged area; this timing is consistent with the Japan Meteorological Agency (JMA) wind damage assessment. Over the damaged area, the diameter of the misocyclone in the Doppler velocity was estimated to be smaller than 893 m, and the peak tangential wind speed and the vorticity of the vortex were estimated to be at least 8 m s−1 and −3.6 × 10−2 sec−1, respectively. This study discusses various possible explanations for the relationship between the misocyclone and wind gust and provides a first overview of a wintertime anticyclonic misocyclone associated with a surface wind gust on the coast of the Sea of Japan and may provide useful insights to the understanding of wintertime vortices.
- 著者
- Hanako Y. Inoue Kenichi Kusunoki Toru Adachi Chusei Fujiwara Naoki Ishitsu Ken-ichiro Arai
- 出版者
- Meteorological Society of Japan
- 雑誌
- SOLA (ISSN:13496476)
- 巻号頁・発行日
- vol.15, pp.228-233, 2019 (Released:2019-11-12)
- 参考文献数
- 24
The characteristics and finescale evolution of misovortices within a snowband were examined using low-level high-resolution single- and dual-Doppler radar analysis. From 02:00 to 06:00 JST on 17 January 2017, many misovortices developed within three snowbands in the Japan Sea coastal region. The vortices developed along the shear line between the offshore north-northwesterly and the coastal northeasterly. As discussed in several previous studies of misovortices along airmass boundaries, horizontal shearing instability was considered to be a possible mechanism responsible for misovortex formation. A detailed investigation was performed on the most distinct snowband and misovortices embedded within it. Dual-Doppler analysis revealed a detailed behavior of vortex during merger, such as the morphological change from quasi-circular to elliptical shape, and the counterclockwise rotation which caused high-amplitude inflection of the shear line in less than 10 minutes. During the decay stage, the vortices weakened along with weakening convergence. The results suggest that evolution of the misovortex appears to have been closely tied to the low-level convergence within the vortex.
- 著者
- Hanako Y. Inoue Kenichi Kusunoki Toru Adachi Chusei Fujiwara Naoki Ishitsu Ken-ichiro Arai
- 出版者
- Meteorological Society of Japan
- 雑誌
- SOLA (ISSN:13496476)
- 巻号頁・発行日
- pp.2019-041, (Released:2019-10-18)
The characteristics and finescale evolution of misovortices within a snowband were examined using low-level high-resolution single- and dual-Doppler radar analysis. From 02:00 to 06:00 JST on 17 January 2017, many misovortices developed within three snowbands in the Japan Sea coastal region. The vortices developed along the shear line between the offshore north-northwesterly and the coastal northeasterly. As discussed in several previous studies of misovortices along airmass boundaries, horizontal shearing instability was considered to be a possible mechanism responsible for misovortex formation. A detailed investigation was performed on the most distinct snowband and misovortices embedded within it. Dual-Doppler analysis revealed a detailed behavior of vortex during merger, such as the morphological change from quasi-circular to elliptical shape, and the counterclockwise rotation which caused high-amplitude inflection of the shear line in less than 10 minutes. During the decay stage, the vortices weakened along with weakening convergence. The results suggest that evolution of the misovortex appears to have been closely tied to the low-level convergence within the vortex.
- 著者
- Kenichi Kusunoki Ken-ichiro Arai Hanako Y. Inoue Chusei Fujiwara
- 出版者
- Meteorological Society of Japan
- 雑誌
- SOLA (ISSN:13496476)
- 巻号頁・発行日
- pp.2019-042, (Released:2019-10-24)
On December 11, 2012, a wind gust caused an F0-intensity wind damage in the Shonai area, Yamagata Prefecture, Japan. This paper provides an overview of an anticyclonic misocyclone (i.e., anticyclonic circulation in the Doppler velocity) related to a wind gust from X-band Doppler radar data. The anticyclonic misocyclone was embedded within a cell with a spiral echo diameter of approximately 3-4 km. The misocyclone over the Sea of Japan moved southeastward at a speed of 11 m s−1, made landfall, and passed over the damaged area; this timing is consistent with the Japan Meteorological Agency (JMA) wind damage assessment. Over the damaged area, the diameter of the misocyclone in the Doppler velocity was estimated to be smaller than 893 m, and the peak tangential wind speed and the vorticity of the vortex were estimated to be at least 8 m s−1 and −3.6 × 10−2 sec−1, respectively. This study discusses various possible explanations for the relationship between the misocyclone and wind gust and provides a first overview of a wintertime anticyclonic misocyclone associated with a surface wind gust on the coast of the Sea of Japan and may provide useful insights to the understanding of wintertime vortices.