长三角冷暖急转气温坐“过山车”

Group 1 - The article discusses the significant temperature fluctuations in the Yangtze River Delta region during the Spring Festival, with initial warm temperatures followed by a sharp drop due to a strong cold air mass moving southward [1][2] - On February 15, temperatures in major cities like Shanghai, Zhejiang, Jiangsu, and Anhui reached above 20°C, with specific readings such as 21.1°C recorded at the Xujiahui station in Shanghai [1] - The cold air front began affecting the northern part of the Yangtze River Delta on February 15, leading to a forecasted temperature drop of 12°C to 22°C in some areas by February 16 [1] Group 2 - The Jiangsu Meteorological Station predicts that by the morning of February 17, temperatures in the northern Huai region could drop to around -3°C, while Zhejiang is expected to see minimum temperatures between 1°C and 4°C starting from the evening of February 15 [2] - Shanghai is forecasted to experience a temperature drop to between 5°C and 7°C on February 16, with a noticeable damp cold feeling [2] - The cold spell is expected to be brief, with temperatures in the Yangtze River Delta projected to gradually rise again starting February 17, potentially reaching above 20°C by around February 20 [2]