“三九”暖如春！全国大部开启大回暖模式，长江沿线将冲击20℃

Core Viewpoint - The recent cold wave has affected many regions in China, but temperatures are expected to rise significantly above normal levels in the coming days, particularly along the Yangtze River where highs may reach 20°C during the "Three Nines" period [1]. Temperature Trends - The cold air mass has caused temperatures to drop to recent lows from January 10 to 11, with many northern areas experiencing temperatures below freezing [1]. - Despite the active cold air, the intensity is weak, leading to a general warming trend across most regions, especially in Northwest, North China, Huanghuai, Jianghuai, Jiangnan, and South China, where temperatures may exceed normal levels by more than 10°C [1]. - The highest temperatures are expected between January 14 and 16, with areas in South North China and Huanghuai reaching around 15°C, and the Yangtze River region possibly exceeding 20°C [1]. Local Records - In major cities, Hefei is forecasted to reach a high of 20°C on January 16, potentially breaking the local record for mid-January warmth [3]. - Hangzhou is expected to have three consecutive days with highs of 20°C or above from January 14 to 16, while Changsha may see highs of 22°C on January 14 and 16 [3]. Temperature Variability - Although daytime temperatures are rising significantly, nighttime temperatures are expected to remain low due to a lack of cloud cover, leading to a substantial diurnal temperature range of 10°C to over 15°C [3]. - Public is advised to dress in layers to cope with the significant temperature fluctuations [3]. Future Weather Outlook - A strong cold air mass is anticipated to arrive on January 17, bringing noticeable cooling to the Northwest and much of Central and Eastern China, with average temperatures expected to shift from above normal to below normal by late January [3].