7名中国游客沉入贝加尔湖溺亡事件是发生在贝加尔湖已经开始松动的湖冰冰面上。 复旦大学大气与海洋科学系博士生、中国气象局气象科普团成员@风云梦远 介绍，贝加尔湖作为亚欧 板块内分离拉张边界形成的断陷湖，湖水相当深而地形崎岖——不仅是包括湖面冻结后下方水层仍有复 杂水下地形与涌流，也包括周边的环湖山脉和一些继续张裂的谷地。冰面之下的涌流和冰面之上复杂地 形和风，导致冰面并不平整。 向逝者致哀，希望大家务必注意天气与安全。 然而更直接的原因，是当前的急剧回暖导致冰面的部分融化与松动。最近在高空暖脊前侧，强烈的偏南 风携带暖气团大举北上，不仅给我国大部带来强烈回暖，甚至直趋贝加尔湖沿岸。贝加尔湖畔的伊尔库 茨克2月19日最高气温甚至达到13.8°C，较2月每日最高均温偏高了约25°C；甚至全天均温也高于了 0°C。在这样的条件下，冰面很容易出现部分融化与裂缝，载重较大的车很容易在薄弱处坠入；下方的 湖水温度依然极低且深度很深，人坠入后会快速失温。 来源：中国气象局 ...

本报讯 （成都日报锦观新闻记者 谢夏冬） 大寒将尽，立春将至，正值乍暖还寒时。1月30日，成都阳 光"上线"，15时全市平均气温约为11.4℃。 成都市气象台首席预报员韦玮告诉记者，今年1月以来（1月1日—29日），成都天气呈现出气温显著偏 高、降水异常偏少、静稳天气多发的特征。我市平均气温6.6℃，较常年同期（5.8℃）偏高0.8℃；累计 降水量2.3毫米，较常年同期（9.0毫米）偏少七成；冷空气影响弱，以静风或弱风为主，早晚逆温层频 繁出现，天气静稳。 2月即将开启，天气将如何变化？据中国天气网，从最高气温看，全国大部地区气温将在明后天陆续开 始迅速触底反弹。2月4日也就是立春前后，我国多地气温将较常年同期大幅偏高。 转自：成都日报锦观 下周立春 成都最高气温升至18℃ 据了解，未来10天，四川盆地无强冷空气影响，最高气温将冲击20℃。韦玮告诉记者，预计未来一周成 都天气平稳，以阴天间多云为主，无明显降雨和冷空气影响，日最高气温将缓慢回升至18℃左右。预计 立春节气期间（2月4日—17日），我市平均气温8.5℃，较常年同期（8.1℃）偏高0.4℃，节气内冷空气 偏弱，天气较平稳。 值得留意的是，此次回暖更 ...

Core Viewpoint - The recent weather in China has been characterized by warming and dryness, with significant temperature increases expected in various regions, creating an unusual early spring-like atmosphere [1][3]. Temperature Trends - The highest temperature line of 15°C is expected to extend northward to southern Hebei, while the 20°C line will rise to southern Henan and central Jiangsu, with many areas in the northwest to south China experiencing above-normal temperatures, particularly in the Huanghuai to Jiangnan regions, where the maximum temperature may exceed 10°C [3][6]. - Specific cities like Hefei, Nanjing, Hangzhou, Changsha, and Nanchang are forecasted to reach maximum temperatures of 20°C, 20°C, 22°C, 22°C, and 21°C respectively, indicating a significant deviation from typical January temperatures [3][5]. Weather Conditions - The upcoming days are expected to have plenty of sunshine with little rain or snow across most of the country, contributing to the warming trend [6]. - Despite the daytime warming, there will be significant temperature differences between day and night, with some areas experiencing temperature variations exceeding 15°C [7]. Cold Air Influence - A strong cold air mass is anticipated to impact most of China starting this weekend, leading to much colder conditions in the northeast, with minimum temperatures dropping below -30°C in some areas [10]. - The cold air is expected to move southward gradually rather than in a sudden burst, indicating a prolonged period of colder weather following the recent warmth [10]. Future Weather Patterns - The current dry weather pattern in the central and eastern regions is likely to change as active warm and moist air flows may lead to widespread rain and snow events [10]. - Historical data indicates that the first typhoon of the year typically forms around March 25, but there have been instances of January typhoons, with the earliest recorded in 2019 [12].

Core Viewpoint - The weather in Changsha is experiencing an unusual warmth during the "Three Nine" period, with temperatures expected to rise significantly, reaching around 21°C in the coming week [1][4]. Weather Forecast - The weather forecast for the next five days indicates a transition from cloudy to sunny conditions, with maximum temperatures increasing from 13°C on Monday to around 21°C on Tuesday and Wednesday [1]. - The warm weather is accompanied by significant temperature differences between day and night, with nighttime lows ranging from 5°C to 11°C [1][4]. Weather Risks - There is a notable risk of forest fires and fog in various regions of Hunan province, particularly in cities like Changsha, Xiangtan, and Zhuzhou, with high fire risk levels expected [4]. - Citizens are advised to remain cautious of the low temperatures in the early morning and evening, despite the daytime warmth, and to stay hydrated and moisturized due to the dry air [4][5].

Group 1 - Shanghai's temperature is experiencing a slight rise today, with the lowest temperature recorded at 5.3℃ in the city, while some districts dropped below freezing [1] - A cold air mass is expected to bring temperatures back down below 10℃ tomorrow, with highs only reaching between 2℃ and 7℃, and lows in suburban areas dropping to between -4℃ and -2℃ [1] - Next week, after a cold start on Monday with temperatures around 1℃, a significant warming trend is forecasted, with temperatures rising to 16℃-17℃ by midweek [4] Group 2 - The upcoming warm spell is described as a "retaliatory warming" during the coldest period of winter, which is somewhat unusual but has been observed in the context of global warming [6] - Historical data indicates that extreme temperature records in January have previously exceeded 20℃ in Shanghai, suggesting that such warm spells can precede subsequent cold fronts [6] - The weather will remain dry, with relative humidity dropping to as low as 20%, indicating a need for hydration and caution regarding fire and electrical safety at home [6]