Group 1 - The core viewpoint of the articles highlights the unprecedented rainfall and extended rainy season in North China, marking it as the strongest since 1961 [2][6][13] - The North China rainy season began on July 5, 2023, which is 13 days earlier than the average, and lasted for 59 days, significantly longer than the typical 30 days [6][13] - The cumulative rainfall in North China has been exceptionally high, with some areas experiencing rainfall amounts 50% to 200% above the historical average [8][10] Group 2 - The rainfall has led to significant hydrological impacts, with 23 rivers exceeding warning levels, prompting a level IV flood defense response in Sichuan and Shaanxi provinces [1] - The rainfall has caused secondary disasters such as mountain floods and urban waterlogging, while also alleviating drought conditions in some regions [8][10] - The meteorological conditions contributing to this unusual weather pattern include abnormal sea surface temperatures in the equatorial Pacific and strong subtropical high pressure in the western Pacific [15]

记者从中国气象局国家气候中心了解到，今年我国的华北雨季已于9月2日正式结束，其持续时间和累计雨量均创下历史新高，成为自1961年以来最强雨季。 今年华北雨季持续时间和累计雨量均创新高 根据气象行业的规定，华北地区的雨季开始时间，是以京津冀、山西和内蒙古这三个区域中最早进入雨季的那个日期来确定的。具体到每个区域，判断是否 进入雨季的标准是： 气象数据统计显示，6月以来，全国平均降水量总体已经接近常年同期，但空间分布不均，呈"南北多、中间少"的分布，降雨带主要分布在我国北方地区。 其中华北北部、内蒙古中南部、陕西北部等地降水量较常年同期偏多五成至两倍，内蒙古降水量为1961年以来历史同期第二多。 内蒙古自治区气候中心杨司琪：今年的7月5日，内蒙古中部已经有25个气象站达到了单站雨季开始的监测标准，标志着内蒙古的中部雨季正式开始，也是 1961年以来持续时间最久的雨季。这样超长的雨季在历史上是非常罕见的。内蒙古出现过两次持续时间大于30天的雨季，持续的强降水在部分地区引发了山 洪和地质灾害，而且在一些低洼地区的农田出现了渍涝。 但影响是双重的，从经济方面上来看，雨季内的持续性降水有效缓解了中西部部分地区的旱情，为牧 ...

Core Insights - The North China rainy season has been notably prolonged this year, lasting 55 days as of August 28, compared to the average of 30 days, marking the earliest start since 1961 [1][2][4] - The rainy season has been characterized by increased rainfall, with cumulative precipitation exceeding the normal value by 131% as of August 25 [1][2] - Multiple factors contribute to the extended duration and intensity of the rainy season, including abnormal sea surface temperatures in the equatorial Pacific and a strong subtropical high pressure system [4][5][6] Rainfall Characteristics - There have been 29 significant rainfall events since the onset of the rainy season, with 10 classified as strong and 2 as exceptionally strong [2] - Notable rainfall amounts include over 250 mm in certain areas, with specific locations like Beijing's Miyun District recording 573.5 mm and Baoding in Hebei reaching 605.8 mm [2][5] Climate Change Implications - The record-breaking rainy season is seen as a local manifestation of global climate system changes, with increasing frequency and intensity of extreme weather events [6][7] - Experts suggest that the duration of the rainy season may continue to exhibit interdecadal variability, with a trend of increasing duration observed since 2011 [6][7]

Core Viewpoint - The North China rainy season has been notably prolonged this year, lasting 55 days as of August 28, which is significantly longer than the average duration of 30 days, influenced by various climatic factors [1][2][4]. Summary by Relevant Sections Rainy Season Characteristics - The rainy season in North China began on July 5, 13 days earlier than the average start date of July 18, marking the earliest onset since 1961 [2][5]. - As of August 25, the cumulative rainfall in the monitoring area was 131% above the normal seasonal value [2]. Rainfall Events - There have been 29 significant rainfall events since the onset of the rainy season, with 10 classified as strong and 2 as exceptionally strong [3]. - Notable rainfall amounts include over 250 mm in certain areas, with specific locations like Beijing's Miyun District recording 573.5 mm and Baoding in Hebei reaching 605.8 mm [3]. Influencing Factors - The prolonged rainy season is attributed to several factors, including abnormal sea temperatures in the equatorial Pacific, a strong and shifted subtropical high-pressure system, typhoon activity, and geographical features [5][6]. - The subtropical high-pressure system has been particularly strong and has shifted northward, facilitating the influx of warm, moist air from the south [6]. Climate Change Context - The record-breaking rainy season is seen as a local manifestation of global climate change, with increasing frequency and intensity of extreme weather events [7][8]. - Experts suggest that while the rainy season's duration has shown an increasing trend since 2011, it is too early to definitively conclude that this "warming and wetting" trend will continue [7][8].

京津冀等地有较强降水，华北雨季为何"超长待机"？ 中新网北京8月27日电(记者 邵萌)北方地区新一轮降雨过程持续。 气象监测显示，昨日，青海东北部、甘肃南部、宁夏南部、陕西北部、山西北部、内蒙古中部偏南地区、河北北部、北京东北部、 四川盆地西部等地出现大到暴雨，甘肃定西等局地大暴雨。 据中央气象台预计，北方降水过程今明两天仍将持续，降雨区呈现逐步东移趋势。今天核心降雨区转移至华北，明天主要降雨区将 进一步东移至辽宁等地，部分地区将有大到暴雨，局地大暴雨。 京津冀辽等地有较强降水 中央气象台今日10时继续发布暴雨黄色预警，预计27日14时至28日14时，辽宁中南部、河北东部和南部、北京、天津、山东西北 部、青海东部、甘肃中南部、陕西南部、山西西南部、川西高原北部、四川盆地西部和南部以及广东南部沿海、海南岛等地部分地 区有大到暴雨。 其中，河北东部和南部、辽宁南部、四川盆地西部、广东南部沿海等地局地有大暴雨(100~150毫米)。上述部分地区伴有短时强降水 (最大小时降雨量20~50毫米，局地可超过70毫米)，局地有雷暴大风等强对流天气。 资料图：2025年7月25日，北京市民在雨中出行。中新社记者 贾天勇 摄 ...