The tropical cyclones (TCs) and convective storms have a significant impact on triggering widespread flooding in vulnerable areas. However, it is not clear whether the TCs stimulate the convective precipitation over the Al-Hajar Mountains in Oman or suppress it although it had been shown in many studies that TCs suppress the local convection development. This study aims to test the applicability of the hypothesis that the TCs suppress the convection over mountainous to the Al-Hajar Mountains. In order to test the hypothesis of tropical cyclones’ impact on local convection development over the Al-Hajar Mountains, this study considers three different cases during the premonsoon season between 2007 and 2018. The results revealed that weak local convection is reported over the Al-Hajar Mountains during the presence of the cyclones in the Arabian Sea and during the period of their direct impacts. The rainfall in these cases was mainly from stratiform clouds. Therefore, the impact of TCs on the convective suppression over the mountains is applicable to the Al-Hajar Mountains. This study will provide decision-makers and policy creators with knowledge as to whether the Al-Hajar Mountains are susceptible and vulnerable to the risk of torrential downpour, flash flooding, and thunderstorms as what is believed to be.

中文翻译：

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2007-2018年季风季节前的热带气旋对阿曼哈吉尔山对流的影响

热带气旋和对流风暴对在脆弱地区引发大面积洪水具有重大影响。但是，尚不清楚TC是否刺激阿曼Al-Hajar山区的对流降水或抑制它，尽管许多研究表明TC抑制了局部对流的发展。这项研究旨在检验TC抑制Al-Hajar山区对流的假设的适用性。为了检验热带气旋对Al-Hajar山区对流发展的影响的假设，本研究考虑了2007年至2018年季风季节期间的三种不同情况。结果表明，在阿拉伯海中旋风的存在及其直接影响期间，哈哈尔山脉上空的局部对流较弱。在这些情况下，降雨主要来自层状云。因此，TCs对高山对流抑制的影响适用于Al-Hajar山脉。这项研究将为决策者和政策制定者提供有关哈吉尔山脉是否容易遭受暴雨，山洪暴发和雷暴的危险的知识。