The timing of short extreme rainstorm, which was usually thought to occur on midsummer afternoons, was investigated to improve future mitigation options for infrastructure and safety from localised flash flooding. Using a peak-over-threshold approach, the timing of 10- and 60-min extreme events was filtered from high-resolution rainfall series assessing diurnal, seasonal, and annual distributions and analysed for spatial variations and prevailing atmospheric circulation types (CTs). The diurnal distribution showed a clear deviation from that of the entire rainfall regime. A complex spatial pattern was identified with distinct timing signatures of storms in the northern (mostly afternoon) and southern regions (a bimodal distribution with a second peak in the early morning) of Germany and a more homogenous diurnal distribution of events across the central regions. Most storms occurred in summer, but 42% of 10-min events occurred outside the summer months (June–July–August). A distinct annual clustering of extremes was identified, which varied distinctly between the 10- and 60-min extremes, indicating that the sub-hourly and hourly events were far from running conterminously. The timing of extreme events on the investigated time scales was not dominated by the occurrence of specific CTs in most cases, suggesting that other factors control these extremes.

人们通常研究了通常在仲夏下午发生的短时极端暴雨的时间，以改善将来因局部性山洪暴发而对基础设施和安全造成的影响的缓解方案。使用峰值阈值方法，从评估每日，季节性和年度分布的高分辨率降雨序列中过滤了10分钟和60分钟极端事件的时间，并分析了空间变化和主要的大气环流类型（CT）。日分布显示出与整个降雨状况明显不同。确定了一个复杂的空间格局，在德国北部（大部分为下午）和南部地区（双峰分布，并在清晨出现第二个高峰），风暴出现了明显的时间特征，而中部地区的事件昼夜分布更为一致。大多数风暴发生在夏季，但是10分钟内发生的事件中有42％发生在夏季月份（6月至7月至8月）之外。确定了一个明显的年度极端聚类，在10分钟和60分钟极端之间有明显差异，这表明亚小时和每小时事件远非连续发生。在大多数情况下，极端事件的发生时间在所调查的时间范围内并不受特定CT发生的支配，这表明其他因素控制了这些极端事件。但是10分钟的事件中有42％发生在夏季月份（6月至7月至8月）之外。确定了一个明显的年度极端聚类，在10分钟和60分钟极端之间有明显差异，这表明亚小时和每小时事件远非连续发生。在大多数情况下，极端事件的发生时间在所调查的时间范围内并不受特定CT发生的支配，这表明其他因素控制了这些极端事件。但是10分钟的事件中有42％发生在夏季月份（6月至7月至8月）之外。确定了一个明显的年度极端聚类，在10分钟和60分钟极端之间有明显差异，这表明亚小时和每小时事件远非连续发生。在大多数情况下，极端事件的发生时间在所调查的时间范围内并不受特定CT发生的支配，这表明其他因素控制了这些极端事件。