七下八上

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“七下八上”已过 为何降雨仍频繁?
Yang Shi Wang· 2025-08-23 03:48
Group 1 - The Central Meteorological Administration issued a blue rainstorm warning on August 23, predicting two rain belts across China, with the north experiencing rainfall concentrated in North China and Northeast regions, while the south will see significant rain in areas influenced by monsoon currents such as Yunnan, Guizhou, and Sichuan Basin [1] - In Yunnan, heavy rainfall since August 21 has led to the emergency relocation of 4,969 people, with the maximum hourly rainfall recorded at 57.5 mm in Zhaotong [2] - In Qujing, Yunnan, strong rainfall has caused 50 individuals to be trapped, necessitating emergency rescue operations to safely relocate them [3][5] Group 2 - In Shanxi's Yuncheng County, continuous heavy rainfall has resulted in rising river levels, obstructing local villagers' passage due to flooding [6][8] - The meteorological data indicates that during the "July down, August up" period, the national average precipitation has been above normal, with certain regions in North China, East China, and South China experiencing rainfall 50% to 200% higher than the historical average [10] - The persistent rainfall in North China is attributed to the positioning and strength of the subtropical high-pressure system, which has created a conducive environment for frequent rain events [10]
“七下八上”期间降雨有何特点?如何防范?分析解读↓
Yang Shi Wang· 2025-08-03 09:44
央视网消息:本轮多地的降雨天气正值我国"七下八上"防汛关键期,这也是每年防汛形势最为复杂严峻的时期。"七下八上"期 间的降雨有何特点?应该如何防范? "七下八上"降雨主要形态:"锋面暴雨"和"暖区暴雨" 当冷空气势力较弱或距离较远时,冷暖对峙较弱,夏季风输送来的大量的水汽就在北方部分地区不断堆积,形成高温、高湿,让我 们感到闷热不适的环境,小范围的强对流一触即发。通常扣动这些对流的"扳机",包括地形对暖湿气流的抬升、海陆风、低空急流 等,这种对流又称为"暖区对流"。分散的暖区对流并不能造成区域性的强降雨。 中央气象台首席预报员徐珺介绍,"七下八上"的降雨,主要可呈现两种不同的形态。夏季风为北方地区带来充沛的水汽,当伴随大 范围明显冷空气作用时,冷暖对峙较为激烈。这些水汽将以大范围降雨的形式被消耗,通常称为"锋面暴雨"。这张卫星云图,正在 影响东北地区的就是一个大范围锋面云系。对峙的强度越为激烈,降雨的强度也倾向于越大,具有范围广、强度大的特点。 ...
本轮华北强降雨为何如此极端?专家解读→
Sou Hu Cai Jing· 2025-07-29 14:49
Core Insights - The extreme rainfall in North China is characterized by prolonged duration and significant localized precipitation, with areas like Beijing experiencing rainfall exceeding 500 to 600 millimeters in just 3 to 4 days, which is equivalent to the annual rainfall for the same period [1] - The occurrence of this extreme weather is attributed to the northward movement of the subtropical high pressure, which continuously transports moisture to the northern regions, compounded by geographical factors that enhance rainfall intensity [1] - The current weather pattern reflects a typical flood season in China, where strong rainfall coincides with high temperatures, leading to challenges in agricultural production, particularly for crops like corn that are in critical growth stages [1] Weather Impact - The strong rainfall process in North China is gradually weakening, with the core rainfall expected to conclude, although short-term thunderstorms and showers may still occur in the next two days [2] - The transition from dry to wet conditions has created a scenario of "drought-flood rapid transition," posing risks to agricultural production, necessitating vigilance against flooding and pest issues [1]
让人七上八下的“七下八上”到底有多猛?
Yang Shi Xin Wen· 2025-07-26 09:17
进入7月下旬,北方多地开启了多雨模式,河北、内蒙古多地出现破纪录的大暴雨或特大暴雨……一年 一度的"七下八上"防汛关键期又到了。什么"七下八上",不是"七上八下"吗?是搞错了吗?一起来听它 自己的解释吧~ 大家好,我就是传说中的"七下八上"。要说我和"七上八下"有什么关系,那可能是我的到来意味着华 北、东北等地主雨季开启,进入一年中降雨最集中的日子,让大家心里有点"七上八下"吧。 我一般出现在每年的7月下旬到8月上旬,这也是我名字的由来,按照雨季防汛标准,我的在岗时间段也 可以延伸到7月下半月到8月上半月。在岗期间,我铆足了劲地提升北方的降雨指标,基本上我一个月的 雨量就能占全年的三分之一。靠我的实力,华北、东北地区,甚至黄淮以及陕、甘、宁部分地区,都将 体验到一年中最集中的雨。 可别小瞧了这雨,我虽然身在北方,但造雨能力可不比南方雨季弱,我最擅长的技能就是暴雨产出,并 附赠雷暴大风等强对流套餐。 从1991年至2020年的历史大数据可以看到,我管辖区域内省会级城市7至8月的降雨量几乎可以占到全年 总雨量的一半。比如,北京、石家庄、济南、天津、沈阳5市两个月降雨量占全年的比例都在50%以 上,也就是一年中一半 ...
不同区域主汛期时间有何不同?怎样看懂防汛高频词?一文了解
Yang Shi Xin Wen Ke Hu Duan· 2025-07-11 09:22
眼下,我国从南到北已全面进入主汛期。在我国,东北、华北、长江中下游、华南等不同区域的主汛期的时间有所不同,一起来了解。 主汛期是指一年中降水集中、河流水位较高、洪涝灾害多发的时期。由于我国降雨的时空分布不均,不同区域主汛期时间也不同。 华北和东北地区 主汛期为7月至8月 在华北和东北地区,主汛期为7月至8月,且降雨多集中在7月16日至8月15日,这也是我们常常提到的"七下八上"防汛关键期。这一时期常发生洪涝灾 害,如城市内涝、河流堤坝险情等,需要重点防范。 而西北地区,主汛期则较短,多在7月至8月,部分山区因暴雨可能引发山洪。 防汛水位一般分为警戒水位和保证水位 每年主汛期来临,江河水位随之上涨。超警、超保、编号洪水等专业名词会被反复提及,那么这些防汛高频词都代表着什么?防汛水位有哪些?是怎么 分类的? 长江中下游地区 主汛期多在6月至8月 在长江中下游地区,主汛期多在6月至8月,其中6月中下旬至7月上旬是"梅雨"期,在此期间持续阴雨,高温高湿,降水频繁且不均匀,并常伴有雷暴等 强对流天气。 华南地区 主汛期从4月持续到10月 在广东、广西、福建等华南地区,受东南季风和台风影响,从4月开始进入主汛期,降雨集中 ...