An observational study of the exceptional ‘Ottery St Mary’ thunderstorm of 30 October 2008
An observational study of the exceptional ‘Ottery St Mary’ thunderstorm of 30 October 2008
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对 2008 年 10 月 30 日特殊“奥特里圣玛丽”雷暴的观测研究
DOI：
10.1002/met.187
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发表时间：
2011
影响因子：
2.7
通讯作者：
M. Clark
中科院分区：
文献类型：
--
作者：
M. Clark
2008年10月30日凌晨，一个小而强的对流系统影响了德文郡东部的部分地区，在3小时内产生了约200毫米的降水，包括局部超过20厘米的冰雹。从观测的角度研究了这场特殊的风暴及其环境。高空和卫星观测表明，风暴是在一个不稳定性和上升动力强迫增加趋势的环境中发展起来的，这与上层冷池的接近和小的正位涡异常有关。地面观测分析显示，对流发展强烈集中于中尺度地面低压区附近的局部持续低层辐合和水汽辐合，该低压区在德文郡东部缓慢移动之前迅速加深。雷达、风廓线仪和其他可用的观测资料被用来描述对流系统的发展和演变，并确定一些导致异常降雨和冰雹总量的其他因素。最后，讨论了真实的时间，这些不同的观测类型的同时分析，可以在本地化，极端降雨事件的临近预报中发挥的作用。© Crown Copyright 2010.经HMSO主计长许可复制。出版社：John Wiley & Sons，Ltd
A small but intense convective system affected parts of east Devon during the early hours of 30 October 2008, producing an estimated 200 mm of precipitation, including locally over 20 cm of hail, within a 3 h period. This exceptional storm and its environment are studied here from an observational perspective. Upper air and satellite observations show that the storm developed within an environment characterized by a trend for increasing instability and dynamic forcing for ascent, associated with an approaching upper level cold pool and small positive potential vorticity anomaly. Analysis of surface observations reveals that convective development was strongly focussed by localized, persistent low‐level convergence and moisture convergence in the vicinity of a mesoscale surface low pressure area, which rapidly deepened before becoming slow moving over east Devon. Radar, wind profiler and other available observations are used to describe the development and evolution of the convective system, and to identify some additional factors contributing to the exceptional rain‐ and hail‐fall totals. Finally, the role that real‐time, simultaneous analysis of these various observation types could play in nowcasting of localized, extreme rainfall events is discussed. © Crown Copyright 2010. Reproduced with the permission of the Controller of HMSO. Published by John Wiley & Sons, Ltd