本周末，京津冀地区将继续遭受降雨侵袭，气象部门预计，本周末京津冀地区将有明显降雨天气，局地可能出现暴雨，并伴有强对流天气。据气象监测显示，北京昨日已现明显降雨过程，全市平均降水量达12.6毫米，最大降水量达113.9毫米。北京市气象台已发布暴雨蓝色预警信号，提醒公众注意出行安全，避开低洼路段和山区、河道等灾害隐患区域。
天津和河北的降雨也在逐渐发展，预计本周末河北将迎来系统性降水过程，张家口、承德、保定、廊坊、石家庄等局地可能出现中到大雨，个别地区甚至有暴雨。气象部门提醒，暑期和周末出游高峰期间，公众出行前应关注天气预警预报信息，尽量避免前往山区、河道等灾害隐患区域。
“七下八上”期间，京津冀地区多夜雨的原因在于夏季风的季节性变化。夏季风来临后，西北太平洋副热带高压的位置偏北，其西侧会产生低空急流，夜间低空急流的增强是夜雨产生的关键。此外，地形分布也对低空急流的强度有一定影响，京津冀地区夜间山区空气下沉、平原空气上升，形成温度梯度，通过大气热成风作用，增强低空急流，进而促使夜雨产生。
气象专家提醒，面对持续的降雨天气，公众应密切关注气象部门的预警信息，采取必要的防护措施，确保自身安全。同时，相关部门也应做好应对强降雨可能引发的城市内涝、山洪、滑坡、泥石流等灾害的准备工作。
英语如下：
News Title: “Frequent Night Rainfall in the Beijing-Tianjin-Hebei Region; Experts Explain the Mystery of Heavy Rainfall during the ‘July Down and August Up’ Period”
Keywords: Rainfall Intensity, Night Rainfall, Beijing-Tianjin-Hebei
News Content: This weekend, the Beijing-Tianjin-Hebei (BTH) region will continue to be hit by rainfall, according to the meteorological department’s forecast. The region is expected to experience significant rainfall this weekend, with local areas possibly facing thunderstorms and strong convective weather.
According to meteorological monitoring, Beijing has already seen significant rainfall yesterday, with an average precipitation of 12.6 millimeters across the city and a maximum of 113.9 millimeters. The Beijing Meteorological Observatory has issued a blue warning signal for torrential rain, reminding the public to pay attention to travel safety and avoid low-lying areas, mountainous regions, and riverbanks, which are prone to disasters.
Rainfall is also developing in Tianjin and Hebei, with the province expected to experience a systematic rainfall process this weekend. Local areas such as Zhangjiakou, Chengde, Baoding, Langfang, and Shijiazhuang may see moderate to heavy rain, and some regions could even face thunderstorms. The meteorological department reminds the public to pay attention to weather warning and forecast information before traveling during the summer vacation and weekend travel peak periods, and to avoid going to mountainous, riverbank areas prone to disasters.
The reason for the frequent night rainfall in the BTH region during the “July Down and August Up” period is due to the seasonal changes in the summer monsoon. After the summer monsoon arrives, the position of the subtropical high in the western Pacific shifts northward, causing a low-level jet stream to form on its western side. The enhancement of the low-level jet stream at night is the key to the occurrence of night rain. Additionally, the distribution of topography also has an impact on the strength of the low-level jet stream, as air descends in the mountainous areas at night and rises in the plains, creating a temperature gradient. Through atmospheric thermal convection, the strength of the low-level jet stream is enhanced, leading to the formation of night rain.
Meteorological experts remind the public to closely monitor the warning information issued by the meteorological department in the face of continuous rainfall. They should take necessary precautions to ensure their safety. At the same time, relevant departments should also be prepared to deal with possible urban flooding, landslides, and debris flows caused by heavy rain.
【来源】http://www.chinanews.com/life/2024/08-17/10270474.shtml
Views: 1