Core Viewpoint - The current heavy rainfall in southern China is at its peak, with significant impacts expected across multiple provinces, leading to severe weather warnings and potential disasters [1][3]. Summary by Relevant Sections Rainfall Forecast and Impact - The Central Meteorological Observatory has issued an orange rainstorm warning, predicting heavy to extremely heavy rainfall in several regions including central Jiangsu, central Anhui, southeastern Henan, and parts of Hubei, Hunan, Chongqing, Guizhou, Guangxi, and Yunnan from June 20 to June 21 [1][3]. - Rainfall amounts in some areas have already reached 200 to 350 millimeters, with localized areas exceeding 400 millimeters, and the maximum recorded rainfall is nearly 830 millimeters in Liuzhou, Guangxi [3][5]. Meteorological Analysis - The heavy rainfall is attributed to a typical "Meiyu" (plum rain) pattern, influenced by recent atmospheric circulation changes, including the northward movement of the subtropical high and the convergence of warm moist air from the southwest with cold air from the north [4][5]. - The abundant moisture from the Bay of Bengal and the western Pacific has been transported northward, contributing to the formation of a rain belt spanning across the region [5]. Disaster Preparedness and Warnings - The Ministry of Water Resources and the China Meteorological Administration have jointly issued a red warning for mountain flood disasters, indicating a high likelihood of such events in several provinces, particularly in western Anhui, southeastern Henan, eastern Hubei, and northern Guangxi [6]. - Areas are advised to implement real-time monitoring and flood prevention measures, as risks of mountain floods, geological disasters, and urban flooding are elevated due to the ongoing rainfall [6].

记者20日从中国气象局了解到，我国梅雨季已全面开启。23日前，桂黔湘鄂苏皖等地仍有暴雨或大 暴雨。相关部门20日18时发布暴雨橙色预警、山洪灾害红色预警、地质灾害橙色预警，提醒做好相关防 范工作。 防范暴雨次生灾害：23日前桂黔湘鄂苏皖仍有强降雨 中央气象台预计，桂黔湘鄂苏皖等地强降雨天气将持续至23日，最强降雨时段在20日至21日。雨带 东段自淮河以北逐渐南压至长江下游沿江一带，大别山区等地累计雨量大；西段的广西、贵州、湖南雨 带稳定少动，落区重叠，累计雨量、持续时间具有极端性。 气象专家提醒，相关地区需加强交通、城市运行、旅游景区等安全管理工作，防范强降雨可能引发 的次生灾害。同时，强降雨可能造成农田渍涝，经济林果、水产养殖及农业设施受损，需做好相关防护 工作。 水利部和中国气象局20日18时联合发布山洪灾害气象预警，预计20日20时至21日20时，安徽西部、 河南东南部、湖北东部、湖南北部、广西北部和西部、贵州东南部、云南东部等地部分地区发生山洪灾 害可能性大（橙色预警），其中安徽西部、河南东南部、湖北东部、广西西部、云南东部等地部分地区 发生山洪灾害可能性很大（红色预警），需注意做好防范工作。 新华社 ...