Dissipation Characteristics of Tornadic Vortex Signatures Associated with Long-Duration Tornadoes
Dissipation Characteristics of Tornadic Vortex Signatures Associated with Long-Duration Tornadoes
复制标题
与长持续时间龙卷风相关的龙卷风涡特征的耗散特征
DOI:
10.1175/jamc-d-18-0187.1
复制
发表时间:
2019
影响因子:
3
通讯作者:
Kingfield, Darrel M.
中科院分区:
文献类型:
--
作者:
French, Michael M.;Kingfield, Darrel M.
Weather Surveillance Radar–1988 Doppler (WSR-88D) data from 36 tornadic supercell cases from 2012 to 2016 are investigated to identify common tornadic vortex signature (TVS) behaviors prior to tornado dissipation. Based on the results of past case studies, four characteristics of TVSs associated with tornado dissipation were identified: weak or decreasing TVS intensity, rearward storm-relative motion of the TVS, large or increasing TVS vertical tilt, and large or increasing TVS horizontal displacement from the main storm updraft. Only cases in which a TVS was within 60 km of a WSR-88D site in at least four consecutive volumes at the end of the tornado life cycle were examined. The space and time restrictions on case selection ensured that the aforementioned quantities could be determined within ~500 m of the surface at several time periods despite the relatively coarse spatiotemporal resolution of WSR-88D systems. It is found that prior to dissipation, TVSs become increasingly less intense, tend to move rearward in a storm-relative framework, and become increasingly more separated from the approximate location of the main storm updraft. There is no clear signal in the relationship between tornado tilt, as measured in inclination angle, and TVS dissipation. The frequency of combinations of TVS dissipation behaviors, the impact of increased low-level WSR-88D scanning on dissipation detection, and prospects for future nowcasting of tornado life cycles also are discussed.
登录
查看更多内容
DOI:
--
发表时间:
1978
期刊:
影响因子:
--
作者:
E. Brandes
通讯作者:
E. Brandes
DOI:
--
发表时间:
2003
期刊:
影响因子:
--
作者:
H. Bluestein;C. Weiss;A. Pazmany
通讯作者:
A. Pazmany
影响因子:
3.1
作者:
Johannes M. L. Dahl;M. Parker;Louis J. Wicker
通讯作者:
Johannes M. L. Dahl;M. Parker;Louis J. Wicker
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
Michael M. French;D. Burgess;E. Mansell;Louis J. Wicker
通讯作者:
Louis J. Wicker
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
Alicia Klees
通讯作者:
Alicia Klees