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Numerical analysis of an intense rainstorm occurred in southern Italy

机译：意大利南部发生强暴雨的数值分析

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In this study we conduct a numerical analysis of an intense and destructive storm that occurred over Calabria, southern Italy, on 10-12 December 2003. More than 250 mm of precipitation was recorded over a large area in southern Calabria and one station reported about 660 mm in two days (more than half of the yearly climatological value). Precipitation fell mainly during 11 and 12 December. The storm was characterized by the entrance of an Atlantic upper-level trough associated with a deep surface low that advected humid marine air toward steep Calabrian orography. The steep mountain ridges favoured landslides, which were reported in several villages. Property damage was extensive. We study the storm at the mesoscale by means of the Regional Atmospheric Modeling System (RAMS). The model was successful at representing the observed accumulated rainfall patterns. This justifies our use of RAMS for further analysis of the physical and dynamic factors involved in the storm event. In particular, we use RAMS to evaluate the roles of Calabrian orography, surface latent heat flux, and upper level forcing. The key role of a potential vorticity (PV) streamer, which forced the entire meteorological system from the upper levels is assessed by the PV inversion technique in a Limited Area Model Ensemble Prediction System (LEPS) framework. Results show that the roles of Calabrian orography and surface latent heat flux are important in our simulations. Indeed, humid marine air masses were advected by the synoptic flow toward Calabrian steep coastal mountain ranges determining intense and abundant rainfall.
机译：在这项研究中，我们对2003年12月10日至12日在意大利南部卡拉布里亚上空发生的强烈破坏性风暴进行了数值分析。在卡拉布里亚州南部的大面积地区记录到250毫米以上的降水，一个观测站报告了约660次两天内达到毫米（超过年度气候值的一半）。降雨主要在12月11日至12日下降。风暴的特征是大西洋上层低谷的入口与深处的低地表相关，该低地表将湿润的海洋空气向陡峭的卡拉布里亚地形移动。陡峭的山脊有利于滑坡，据报道在几个村庄。财产损失广泛。我们通过区域大气建模系统（RAMS）研究了中尺度的风暴。该模型成功地代表了观测到的累积降雨模式。这证明了我们使用RAMS进一步分析风暴事件中涉及的物理和动态因素的合理性。特别是，我们使用RAMS来评估卡拉布里亚地形学，表面潜热通量和高层强迫的作用。在局域模型集合预测系统（LEPS）框架中，通过PV反演技术评估了潜在涡流（PV）拖缆的关键作用，它迫使整个气象系统从较高的层次发展。结果表明，卡拉布里亚地形学和表面潜热通量的作用在我们的模拟中很重要。确实，天气向北流向卡拉布里亚陡峭的沿海山脉，导致湿润的海洋气团平流，从而确定了大量的降雨。

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