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 ...

据中央气象台首席预报员陈涛介绍，近期北方强降水过程与大气环流异常有直接关系。7月以来西太平洋副热带高压强度偏强、位置偏北并稳 定维持，副热带高压西部和北部边缘偏南暖湿急流强、大气不稳定性高，产生有利于北方持续性强降水过程的水汽和热力环境条件。 △7月24日9时至25日8时，河北省保定市易县24小时降水量达362.6毫米，易县县城部分路段积水严重。图片来源：易县县委宣传部 与此同时，地形性降水特征显著。在稳定的天气形势下，西北、华北地区在阴山、太行山、燕山山区地形影响下，偏南暖湿气流在山前地区易 形成抬升和辐合，有利于在山前地区重复出现多次强降水天气过程，导致北京、河北等地累计降水量较历史同期明显偏多。 为什么最近雨反复下在华北西北等地？ （中国气象局） 今年7月以来，我国北方地区出现多轮强降水过程，降水落区高度重叠。其中，7月23日至29日，青海、甘肃、内蒙古、京津冀、东北地区等地 的部分地区出现暴雨到大暴雨，河北、北京等地局地出现特大暴雨。 此外，7月中下旬副热带高压南侧洋面热带系统活跃，也额外加强了向北方地区的水汽输送。副热带高压北部边缘的西风带短波槽等天气系统 活动较为频繁，在北方地区重复造成多次降水过 ...

Group 1 - The article discusses the phenomenon of "Sanfu days" being the hottest period of the year, with significant temperature increases due to the imbalance between heat absorption and heat dissipation on the ground [1][2] - It highlights the trend of earlier high temperatures in China, with the first high-temperature day occurring earlier in most regions from 1991 to 2020 compared to 1961 to 1990 [2] - The article notes that the number of high-temperature days has generally increased over the past 60 years, with an average increase of 6.7 days every decade in annual warm days [2] Group 2 - The extreme high temperatures are linked to the Western Pacific subtropical high-pressure system, which has been controlling the weather in the central and eastern regions of China [2] - The article emphasizes the health risks associated with extreme heat, urging the public to take precautions and limit outdoor activities during high-temperature periods [2]

Group 1 - The core period for flood prevention in China is "July to August," characterized by the highest rainfall in northern regions, accounting for about one-third of the annual precipitation in just one month [1] - The concentration of rainfall in northern China during this period is influenced by the subtropical high pressure in the western Pacific, which acts as a "moisture conveyor belt," transporting moisture northward [2] - The geographical features, such as the Taihang Mountains, significantly impact weather systems and rainfall patterns in northern China, contributing to the occurrence of heavy rainfall events [3] Group 2 - The active typhoon season during "July to August" can lead to significant rainfall in northern regions, as typhoons carry large amounts of moisture [3] - Northern regions have a lower capacity to handle heavy rainfall compared to southern regions, necessitating preparedness for disaster prevention and mitigation [3] - Experts warn of potential secondary disasters, such as flash floods and mudslides, due to the strong rainfall events already occurring in northern areas [3]

Core Viewpoint - The upcoming summer heat during the Sanfu period is expected to be intense, with predictions of extreme weather events, including both droughts and floods, particularly in eastern China [2][4]. Group 1: Weather Predictions - The National Climate Center forecasts an increase in extreme weather events during this period, with a notable distribution pattern of rainfall being more abundant in the north and less in the middle regions [2]. - Jiangsu Provincial Climate Center predicts that the Sanfu period will be characterized by high temperatures, with the onset of high heat becoming increasingly delayed into late summer [2][4]. Group 2: Causes of Early Heat - The early onset of high temperatures this year is attributed to an abnormal northward shift of the Western Pacific Subtropical High and an early end to the plum rain season, leading to hot and dry conditions in the Jianghuai region [3]. - The current high temperatures are expected to rebound after the influence of Typhoon Danas subsides, particularly in the Jianghuai area [3]. Group 3: Long-term Trends - Over the past decade, there has been a significant increase in the frequency and intensity of high-temperature days in China, with a trend of earlier starts and later ends to the high-temperature season [4]. - The Long Triangle region has seen record-breaking summer heat since 2010, with a notable increase in the number of high-temperature days [4]. Group 4: Public Safety Measures - The China Meteorological Administration emphasizes the importance of monitoring local weather forecasts, especially for vulnerable populations such as the elderly, children, and those with chronic illnesses [5]. - It is advised to arrange work schedules to avoid high-temperature periods and implement effective heat prevention measures in various industries [5].

Group 1 - The core viewpoint of the articles highlights the upcoming extreme high-temperature weather in Henan Province, with temperatures expected to exceed 37°C from July 13 to 20, peaking between July 14 and 16, where some areas may reach above 40°C and even 42°C [1] - The prolonged high temperatures are attributed to the control of the region by the Western Pacific subtropical high, leading to clear skies and significant solar radiation, as well as the presence of descending air currents causing warming effects [1] - The high-temperature weather poses health risks, increasing the likelihood of heatstroke and acute episodes of chronic diseases, prompting recommendations for the public to avoid outdoor activities during peak heat times [1] Group 2 - Current high temperatures are impacting autumn crops primarily through soil moisture loss and crop growth, with most surface soil conditions being suitable, although some areas are experiencing moisture deficits [2] - The suitable soil conditions may mitigate the effects of high temperatures on crops in their seedling stage, while areas with moisture deficits may experience leaf scorching due to excessive heat [2]

Group 1 - The recent high-temperature weather in Henan has been severe, with temperatures exceeding 37°C across most of the province, and some areas reaching as high as 43°C [1] - The primary cause of this heatwave is the prolonged control of the western Pacific subtropical high, leading to strong solar radiation and minimal cloud cover [1] - Rainfall began on August 8, providing some relief from the heat, but high temperatures are expected to return starting August 12 as the subtropical high re-establishes itself [2] Group 2 - The current humid and hot weather in northern China is linked to the northward movement of the western Pacific subtropical high, which is expected to persist for some time [3] - Although recent rainfall in regions like Hebei and Tianjin has temporarily reduced humidity, the ongoing influence of warm and moist air from the southwest will replenish moisture levels quickly [3] - High humidity combined with high temperatures can impair the body's ability to regulate temperature, increasing the risk of heat-related illnesses, particularly for vulnerable populations [3]

Core Viewpoint - Beijing has been experiencing high humidity and heat, leading to discomfort among residents, attributed to the early northward movement of the subtropical high-pressure system [1] Weather Impact - The subtropical high-pressure system in the western Pacific is crucial for influencing weather patterns in China, with its seasonal activity directly affecting the rainy season across various regions [1] - This year, the subtropical high-pressure system moved north earlier than usual, resulting in increased humidity and the onset of "sauna days" in Beijing [1] Future Weather Outlook - The high-temperature and humid weather in Beijing is expected to continue for at least another week due to the ongoing influence of the subtropical high-pressure system [1] - Short-duration, sudden rainfall events are likely to occur in the afternoons or evenings, necessitating precautions for outdoor activities [1] Public Health Advisory - The meteorological department advises the public to take measures against heat-related illnesses, as high humidity and heat can increase the risk of heatstroke and cardiovascular issues [1] - Recommendations include maintaining a regular sleep schedule, engaging in outdoor activities during cooler morning hours, and ensuring adequate hydration and a light diet [2]

Core Viewpoint - Beijing is experiencing unusual humidity levels comparable to southern regions, leading to discomfort among residents due to high temperatures and moisture in the air [1][2][4]. Weather Conditions - Recent weather in Beijing has shown humidity levels exceeding 70%, with temperatures around 30°C, resulting in a perceived temperature of approximately 35°C [2]. - The current weather pattern is influenced by warm and humid air from the subtropical high-pressure system, causing conditions similar to the typical summer heat experienced in late July to early August [2][4]. Humidity Analysis - The minimum relative humidity in certain districts of Beijing has approached 60%, significantly higher than the historical average of 12.6% for early July [2][4]. - The ongoing high humidity is attributed to the persistent influence of warm, moist air from the western Pacific subtropical high-pressure system, which has led to increased rainfall in the region [4]. Rainfall and Relief - Since June 26, Beijing has experienced continuous rainfall, with forecasts indicating further significant rain, which is necessary to alleviate the current humidity levels [4]. - Meteorological experts suggest that a substantial rain event is required to convert atmospheric moisture into precipitation, providing temporary relief from the high humidity [4].