Heavy rainfall events (HREs) occur almost throughout the year in the Philippines, with relatively limited research during the winter monsoon. This study analyzes the 20-year (2003–2022) daily precipitation from 55 rain gauges and Integrated Multi-satellitE Retrievals for GPM (IMERG) from November to February. HREs are classified into three clusters by employing a cluster analysis on the most pertinent principal modes extracted from the principal component analysis. Each cluster exhibits a distinct heavy rainfall spatial pattern, mostly showing more than 50 mm/day of rainfall in the eastern part of the country. We noted that heavy rainfall in the Philippines during the winter monsoon occurs during a strong East Asian Winter Monsoon and caused by the interaction of shear line and low-level cyclonic vortex. The different location of rainfall maxima in each HRE cluster is a result of the variation of locations of the shear line and cyclonic vortex.

菲律宾几乎全年都会发生强降雨事件（HRE），而冬季季风期间的研究相对有限。本研究分析了 11 月至 2 月 55 个雨量计和 GPM 综合多卫星检索 (IMERG) 的 20 年（2003 年至 2022 年）每日降水量。通过对从主成分分析中提取的最相关的主模式进行聚类分析，将 HRE 分为三个聚类。每个集群都呈现出明显的强降雨空间格局，大部分地区东部地区的降雨量超过50毫米/天。我们注意到，菲律宾冬季风期间的强降雨发生在东亚冬季风较强期间，是由切变线和低层气旋涡相互作用造成的。每个HRE簇中最大降雨量的位置不同是由于切变线和气旋涡的位置变化的结果。