四川天气迎转折！降温降雨又要来了，今天抓紧晒太阳

Core Viewpoint - A significant weather change is expected in China, particularly in the northwest and parts of Sichuan, with cold air, rain, and snow forecasted starting from February 21 [1][3]. Group 1: Weather Warnings and Forecasts - The Central Meteorological Observatory issued blue warnings for cold waves, snowstorms, and sandstorms, while Sichuan is not included in these warnings, indicating it will not be affected by strong winds or cold air today [1]. - The Sichuan Provincial Meteorological Station predicts that from the evening of February 22 to the daytime of February 23, the region will experience rain and a drop in temperature, with some areas expecting moderate to heavy rain [3]. Group 2: Temperature Changes - On February 21, temperatures in many areas of the basin exceeded 21°C, with some locations like Yibin and Dazhou reaching over 23°C, breaking previous records for February [5]. - By February 23, the expected maximum temperatures in Dazhou, Bazhong, Nanchong, Guang'an, Suining, and Ya'an will drop to 15-17°C, while other basin cities will see highs of 18-20°C [5]. Group 3: Duration of Weather Impact - The cold air's impact on the Sichuan basin is expected to be brief, with a return to cloudy weather by February 24, although some areas in the western plateau and the southern region may still experience rain and snow [5].