北方雨季提前开启 未来降雨趋势如何？最新研判

Core Viewpoint - The article discusses the increased rainfall and potential flood risks in China as the critical flood prevention period "July down, August up" approaches, highlighting the need for preparedness in various regions [1][3][5]. Group 1: Rainfall Trends - Most regions in China are experiencing above-average rainfall, with the main rain belt shifting northward to the North China Plain, particularly affecting Henan and Shandong provinces [3][5]. - The sub-tropical high pressure is expected to strengthen, leading to an early onset of the rainy season in northern regions, with significant rainfall predicted from Guangdong to Shandong [1][5]. Group 2: Extreme Weather Events - In Nanyang, Henan, a short-duration extreme rainfall event resulted in over 200 millimeters of rain within just four hours, raising concerns about secondary disasters [3]. - The rainfall is characterized by its suddenness and localized intensity, making it difficult to predict exact locations of heavy downpours [5]. Group 3: Areas of Concern - Regions such as Yunnan, Sichuan, Gansu, Shaanxi, Shanxi, Hebei, Tianjin, Beijing, Liaoning, Jilin, and Heilongjiang are expected to experience increased rainfall over the next ten days, necessitating flood prevention measures [7]. - Urban areas need to prepare for potential flooding, while mountainous regions should be vigilant against flash floods and geological disasters [7].