Core Viewpoint - The article discusses the characteristics and impacts of autumn typhoons in China, highlighting their increasing frequency and intensity compared to summer typhoons, as well as their potential for causing severe weather events and disasters [1][5]. Group 1: Typhoon Statistics - Over 40% of typhoons occur in autumn, with 859 autumn typhoons recorded from 1949 to 2024, closely following the 867 summer typhoons [1]. - Autumn typhoons exhibit greater peak intensity, with over 60% of typhoons in September and October reaching typhoon strength or above, peaking at 74% in October [1]. Group 2: Typhoon Path and Landfall - Autumn typhoons tend to make landfall further south compared to summer typhoons, primarily affecting Guangdong, Hainan, Taiwan, and Fujian, with Guangdong experiencing 72 landfalls [3][5]. - The shift in landfall locations is attributed to the movement of the subtropical high-pressure system, which influences the paths of typhoons [5]. Group 3: Historical Impact of Autumn Typhoons - Historically, nine autumn typhoons have made landfall in China as super typhoons from 1949 to 2024, with significant destructive potential [6]. - The strongest recorded autumn typhoon was "Marge" in 1973, causing over 900 deaths and extensive property damage in Hainan [6]. Group 4: Factors Contributing to Intensity - The combination of high sea temperatures and the presence of cold air masses in autumn increases the likelihood of stronger typhoons, as the temperature gradient enhances wind speeds [6]. - The interaction between autumn typhoons and cold air can lead to extreme rainfall and heightened disaster risks [6]. Group 5: Current and Future Impacts - The upcoming typhoon "Hua Jasha" is expected to impact southern China, potentially combining with cold air to produce extreme weather conditions [7].

Core Points - Shanghai Meteorological Center issued a yellow high-temperature warning, predicting a maximum temperature around 36°C today [1] - The highest temperature at Xujiahui Station exceeded 35°C, marking the 53rd high-temperature day of the year, setting a historical second record [2] - From September to now, the number of high-temperature days in Shanghai reached 8, breaking the historical record for September, previously held at 7 days in 1947 and 1995 [3] Weather Forecast - Starting in the afternoon, a cold front will bring widespread showers or thunderstorms to Shanghai, with potential for short-term heavy rainfall and strong winds [5] - A yellow wind warning was issued, forecasting gusts of 8-10 levels in most areas of the city within the next 12 hours [6] - A yellow lightning warning was also issued, indicating possible lightning activity that could lead to disasters [7] Upcoming Weather Changes - A significant temperature drop is expected on Thursday, with temperatures ranging from 26°C to 29°C, providing a more comfortable feeling [8] - The weather in Shanghai will be influenced by eastern sea air currents, with variable skies and occasional rain, maintaining temperatures between 24°C and 31°C [10]

Summary of Key Points Core Viewpoint - The upcoming weather forecast indicates significant rainfall in northeastern Sichuan and southern Shaanxi, with potential for extreme weather events and secondary disasters due to prolonged rainfall lasting until September 22 [1][5]. Group 1: Rainfall and Weather Conditions - Strong rainfall has been observed in various regions, including the Sichuan Basin and parts of the Yellow River Huaihe area, with some areas experiencing heavy to extreme rainfall [2][5]. - The Central Meteorological Observatory predicts continued heavy rainfall in northeastern Sichuan and southern Shaanxi, with some areas likely to see heavy or extreme rainfall [2][3]. - Rainfall is expected to persist in the northeastern Sichuan and southern Shaanxi regions, with cumulative rainfall exhibiting extreme characteristics [5]. Group 2: Temperature Changes - A significant drop in temperatures is anticipated in northern regions, with maximum temperatures falling below 20°C for the first time this year [8]. - The cold air mass is expected to bring a temperature decrease of 4 to 6°C across many areas, with localized drops exceeding 8°C [8]. - Southern regions will see a relief from prolonged high temperatures, with the heat gradually receding southward and expected to diminish significantly by September 19-20 [8].

据中央气象台预计，今天起，冷空气将影响我国北方地区，局地降温幅度可达10℃以上；明天起，冷空 气南下影响黄淮至江南北部等地，局地降温幅度可达8℃以上。 大范围冷空气来袭，北方局地降温或超10℃ 中新网北京9月16日电(记者 邵萌)今年下半年第一场大范围冷空气过程正在影响我国。 中东部地区出现大范围降温 张涛指出，这是因为17日之后冷空气进入盆地，大气底层转冷，暖湿气流在上层爬升，大气呈现出"上 暖下冷"的稳定结构，难以触发强对流条件。 气象专家提醒，未来一周四川盆地、甘肃南部、陕西南部等地多降雨，部分地区累计降雨量大，发生山 洪、地质灾害、中小河流洪水、城市暴雨积涝等暴雨次生灾害气象风险较高，公众需及时关注当地气象 部门发布的最新预警预报信息，尽量避免前往山区、地质条件脆弱区以及露营地等；外出注意交通安 全，路遇涉水路段遵从防汛指示，避免涉险。(完) 来源：中国新闻网 编辑：徐世明 中央气象台首席预报员张涛介绍，此次冷空气整体移动速度较慢，风力不大，但影响范围极大，路径先 东移后南下，进而导致中东部地区出现大范围降温。 具体而言，9月15日至16日，冷空气自西向东影响我国北方地区，大部地区将有4℃至8℃降温， ...

Group 1 - The core point of the article is the arrival of a significant cold air mass in China, marking the first large-scale cold air event of the second half of the year, which is expected to bring noticeable temperature drops across various regions [1] - The cold air will primarily affect northern China over the next few days, leading to record low temperatures for the year in cities such as Xi'an, Yinchuan, and Zhengzhou, with daytime highs potentially dropping below 20°C for the first time this season [1] - In northern regions like Heilongjiang and Inner Mongolia, temperatures may fall to single digits, with some areas even approaching freezing, indicating a significant shift towards autumn [1] Group 2 - The cold air mass will also push the summer monsoon southward, allowing northern China to transition fully into autumn by the end of the week [4] - In southern China, while the cold air will not lead to an immediate autumn transition, it will help alleviate prolonged high temperatures, with cities like Hangzhou expected to see highs drop below 30°C [6] - Despite the incoming cold air, southern regions are still experiencing extreme heat, with Nanchang setting a record for the most high-temperature days this year, indicating that heat management remains crucial for residents [6]

此次冷空气过程对北方降温影响显著，气温都将大面积创立秋后新低，不少地区将告别短袖、翻出外套 了。其中，明天银川、呼和浩特、17日哈尔滨、长春、太原、西安最高气温或将至20℃，18日郑州和西 安最高气温可能降至20℃以下，为立秋后首次全天低于20℃。 17日至18日早晨，北方会有大量城市最低气温创立秋后新低，呼和浩特、哈尔滨、长春、沈阳、太原、 北京、石家庄、西安、银川、济南、郑州最低气温不足15℃，哈尔滨、长春、呼和浩特甚至不足10℃， 秋凉加重，需注意添衣保暖。 而在冷空气影响到来之前，南方多地今明天高温依然强盛，高温范围还会有所扩大，达到近期巅峰。城 市中，南昌昨天刚刚刷新当地全年高温日数纪录（65天），未来3天还将遭连续高温，武汉和杭州未来 三天也将有两到三天高温，都将继续刷新当地全年高温日数最多纪录。福州今后4天高温持续，将创造9 月连续高温日数纪录和9月高温最多纪录。 18日之后，随着冷空气渗透南下，旷日持久的高温过程也将暂告一段落。像是杭州，17日还有高温，18 日将降至26℃，将创立秋后新低，长沙19日最高气温也将降至26℃，热意明显消退。而且江南大部最低 气温将降至25℃以下，夜间体感明显凉快 ...

Group 1 - The weather in Hangzhou is experiencing a significant fluctuation due to the influence of the subtropical high pressure, with temperatures reaching up to 35°C and a total of 59 high-temperature days recorded so far this year, tying with 2022 for the second-highest in history [1] - The upcoming week is expected to see a transition as cold air begins to penetrate, leading to a decrease in high temperatures, with forecasts indicating a drop to around 30°C starting Thursday [2] - Despite the current dominance of the subtropical high pressure, its influence is gradually weakening, allowing for the possibility of afternoon thunderstorms and rain, particularly in the northeastern regions [1][2] Group 2 - The cold air is anticipated to bring increased rainfall and a cooling effect across the province, with temperatures expected to drop significantly, especially in northern Zhejiang where highs may only reach 28°C [2] - The subtropical high pressure has been persistent since August, but its future strength remains uncertain as it may strengthen again after the current cold air system passes [2] - Continuous monitoring of weather patterns is advised as the interaction between cold air and subtropical high pressure will determine future temperature trends [2]

Summary of Key Points Core Viewpoint - A new wave of cold air is expected to bring significant rainfall to northern China, particularly from the Sichuan Basin to the Huanghuai region, starting September 15, with a notable drop in temperatures across many areas [1][2][6]. Group 1: Weather Changes - The arrival of cold air will lead to increased rainfall in northern regions, with significant rainfall expected in the Sichuan Basin and Huanghuai area starting tomorrow [2][3]. - Areas such as Inner Mongolia, Heilongjiang, and parts of Jiangsu and Anhui have already experienced heavy rainfall, with some regions facing severe weather conditions [2][5]. - The Central Meteorological Observatory predicts that many northern areas will experience moderate to heavy rain, with some regions likely to see torrential rain [2][4]. Group 2: Temperature Fluctuations - A significant drop in temperatures is anticipated across northern China, with cities like Hohhot, Yinchuan, and Zhengzhou expected to see their highest temperatures fall below 20°C for the first time since the start of autumn [6]. - In contrast, southern regions, particularly in Jiangnan and South China, will continue to experience high temperatures, with the potential for record-breaking heat in places like Fuzhou [6]. - The temperature drop in northern areas is expected to exceed 10°C, signaling the onset of autumn, while southern regions will maintain higher temperatures for a longer period [6].

Group 1 - A strong cold air mass is affecting China, leading to significant temperature drops in the northern regions, with temperatures expected to fall by 4 to 8 degrees Celsius, and in some areas by more than 10 degrees Celsius [2][4] - The highest temperatures in northern regions will drop below 20 degrees Celsius for the first time since the beginning of autumn, particularly in cities like Changchun, Hohhot, and Zhengzhou [2][4] - The cold air will also push the autumn process forward in the North China Plain, with cities like Beijing, Tianjin, and Shijiazhuang likely to officially enter autumn next week [4] Group 2 - The southern regions, particularly southern Jiangnan and South China, will experience limited effects from the cold air, with maximum temperatures remaining around 32 degrees Celsius, indicating persistent heat [6] - Heavy rainfall is expected in the southwestern to Huanghuai regions, particularly in areas like the Sichuan Basin and the Shaanxi-Sichuan border, where extreme rainfall may occur [7][9] - The rainfall will be continuous, with significant precipitation expected from the 15th to the 21st, leading to potential secondary disasters such as flash floods and landslides [9][10]

Summary of Key Points Core Viewpoint - The article discusses the upcoming weather patterns in China, highlighting the persistence of high temperatures in southern regions and a significant drop in temperatures in northern areas due to cold air and rain [1]. Weather Forecast - The "autumn tiger" phenomenon will continue in Jiangnan and South China, with regions like Hunan, Jiangxi, Fujian, Guangxi, and Guangdong experiencing prolonged high temperatures [1]. - Wuhan is expected to see high temperatures on September 15-16, potentially breaking the record for the most high-temperature days in a year [1]. Temperature Changes - A cold air mass will become active in northern regions from September 16-18, leading to a collective drop in temperatures, marking the lowest levels seen in the second half of the year [1]. - In the northwest, north China, northeast, and northern Huanghuai regions, maximum temperatures will drop to around 20°C, with minimum temperatures falling below 15°C [1]. - Harbin and Yinchuan are forecasted to experience their first maximum temperatures below 20°C this year, with Harbin's minimum potentially dropping below 10°C for the first time in the second half of the year [1].