上周末冷空气刚送清凉，周一副高又杀了个"回马枪"，过了双休的阳光也按时上岗，杭州气温"蹭 蹭"往上涨，主城区最高温达29.8℃，距"3"字头仅一线之隔。接下来，副高还将继续刷"存在感"，不 过，风王"桦加沙"前来对垒，天气舞台即将开启一场"风雨大戏"。 今年第18号台风"桦加沙"自生成起一路增强，两天之内四连跳，从强热带风暴加强为超强台风，问 鼎今年来全球"风王"，并直扑华南沿海。 中央气象台周一18时继续发布台风橙色预警，台风"桦加沙"（超强台风级）的中心周一下午5点钟 位于广东省阳江市东偏南方向约990公里的巴士海峡海面上，中心附近最大风力有17级（60米/秒）。预 计，"桦加沙"将以每小时20公里左右的速度向西偏北方向移动，周二凌晨移入南海东北部海面，将于周 三在广东深圳到徐闻一带沿海登陆（强台风级或超强台风级，14-16级，45-52米/秒），登陆后强度逐渐 减弱。 从台风路径来看，"风王"并未瞄准浙江，但它是个蕴含巨大能量的"大块头"，外围环流带来的雨水 会影响浙江。据浙江天气网消息，周一夜里开始雨水"登场"，首先受到影响的是沿海地区，周二影响进 一步向西扩张，特别是温州、台州、宁波南部和丽水东部， ...

Group 1 - The city of Guangzhou is expected to experience heavy rain to torrential rain starting from September 7 due to the influence of a tropical system, which will alleviate high temperatures [1][2] - The Guangzhou Flood Control and Drought Relief Headquarters reported that as of September 4, the average rainfall in the city was 1853.5 mm, which is higher than the normal level of 1653.7 mm for the same period but lower than last year's 2307.6 mm [1] - The city has activated emergency responses 46 times this year, including 41 for heavy rain and flooding, 4 for typhoons, and 1 for flood control [1] Group 2 - The upcoming rainfall is expected to cause significant rises in water levels in small and medium rivers, with changes ranging from 1 meter to 3 meters, and some rivers may approach warning levels [2] - The Pearl River Estuary will experience notable storm surge, coinciding with astronomical tides, which may lead to tidal levels exceeding warning thresholds in certain sections of the Pearl River [2] - From September 9 to 10, Guangzhou will see heavy rain to torrential rain, with a transition to mainly overcast weather starting September 11 [2]

Core Insights - Since July, northern China has experienced multiple rounds of heavy rainfall, with significant overlap in precipitation areas, particularly from July 23 to 29, where regions like Qinghai, Gansu, Inner Mongolia, Beijing-Tianjin-Hebei, and Northeast China faced heavy to extremely heavy rainfall [1][3] Weather Patterns - The recent heavy rainfall in northern and northwestern China is directly related to abnormal atmospheric circulation. The intensity of the western Pacific subtropical high has been stronger and positioned further north, creating favorable conditions for sustained heavy rainfall in the north [3] - The active tropical systems in the southern ocean during mid to late July have further enhanced moisture transport to northern regions, contributing to the persistent heavy rainfall [3] - Geographical features also play a significant role, as the terrain in regions like the Yinshan, Taihang, and Yanshan mountains facilitates the uplift and convergence of warm, moist air, leading to repeated heavy rainfall events in areas like Beijing and Hebei, resulting in significantly higher cumulative precipitation compared to historical averages [3]