东北多地最低温或跌破冰点 南方大范围秋雨上线

受冷空气影响，10月13日至14日东北地区最高气温将降至15℃左右或10℃上下1。其中哈尔滨14日最高气温跌至10℃，15日早晨最低气温将达-3℃，为下半年首次跌破冰点1。冷空气影响还将持续，15日至19日新一股冷空气自西向东影响北方地区1。

受冷暖空气交汇影响，南方地区将迎来大范围秋雨过程1。西南地区至长江中下游局地降雨具有极端性特征1。14日湖北南部、湖南北部、重庆东南部、贵州东北部等地部分地区将出现暴雨1，15日后天安徽南部、湖北东南部、湖南北部等地部分地区则有暴雨或大暴雨1。需警惕降雨引发的山洪、滑坡等次生灾害1。同时南方最高气温将超过30℃，部分地区可能出现高温天气1。

A surge of cold air will bring freezing temperatures to much of Northeast China from October 13 to 14, with Harbin's minimum temperature expected to drop to -3°C on the morning of October 15, marking the first time this half-year the low has dipped below freezing 1. The high temperatures across the Northeast will fall to around 15°C or as low as 10°C during this period, with Harbin's daytime high reaching just 10°C on October 14 1. Following this initial cold snap, another wave of cold air will move eastward across northern China from October 15 to 19 1.

Meanwhile, the interaction between cold and warm air masses will unleash extensive autumn rainfall across southern regions 1. Southern areas will experience highs exceeding 30°C, with some localities potentially seeing heat waves, while the Southwest and middle-to-lower Yangtze River valley will face a three-day precipitation event 1. On October 14, heavy rain and downpours are forecast for parts of southern Hubei, northern Hunan, southeastern Chongqing, and northeastern Guizhou 1. From October 15 onward, heavy to severe downpours are expected in parts of southern Anhui, southeastern Hubei, and northern Hunan 1. Authorities are warning of potential secondary hazards including flash flooding and landslides, particularly in areas experiencing extreme rainfall in the Southwest and lower Yangtze River regions 1.