Summary of Key Points Core Viewpoint - A significant temperature drop has occurred across various regions in China due to the influence of cold air and rainfall, with some areas experiencing temperature decreases exceeding 20°C [1][2]. Temperature Changes - The most drastic temperature drop was observed in Shanxi, where most areas saw a decrease of over 20°C compared to the same time yesterday, with specific locations like Changzi dropping from 36.9°C to 10.3°C [2]. - Since May 19, a rare heatwave had affected the northwest and Huanghuai regions, breaking historical temperature records for May, with 103 meteorological stations reporting record high temperatures [1]. Future Temperature Trends - The cooling trend is expected to extend southward towards the Yangtze River, with Jiangsu and Anhui likely to experience temperature drops between 8°C and 16°C [3]. - In the coming days, areas with maximum temperatures above 30°C will significantly decrease, with northern regions seeing highs below 25°C and some areas even below 20°C, while southern regions will see temperatures around 25°C [4].

Group 1 - The overall weather pattern indicates a transition from less precipitation to increased rainfall, particularly in southern regions starting tomorrow [2][5] - The central meteorological authority forecasts significant temperature fluctuations due to the influence of active cold air masses, with a notable drop of 4 to 8 degrees Celsius expected in the central and eastern regions [7][9] - April was recorded as the warmest on record for many regions, with average temperatures in several provinces being the highest for the same period historically [7] Group 2 - The upcoming weather changes will lead to strong convective weather, including heavy rainfall and thunderstorms, particularly affecting the southern regions [2][5] - Specific areas such as Hainan, Guangdong, and parts of Yunnan are expected to experience heavy to torrential rain, with localized areas facing severe weather conditions [2][3] - The temperature in major cities like Zhengzhou is projected to fluctuate significantly, with a rise to 37 degrees Celsius today, followed by a drop to 24 degrees Celsius tomorrow [9]

Group 1 - The weather forecast indicates heavy snowfall in Heilongjiang Province from March 26, 20:00 to March 27, 20:00, with expected snowfall amounts of 5 to 10 millimeters in several areas [1] - Specific regions such as Qitaihe, Mishan, and Hulin may experience wet snow during certain periods [1] - The forecast also includes warnings for local authorities and individuals to take preventive measures against the expected heavy snow [1] Group 2 - The weather conditions from the night of March 26 to the day of March 27 include heavy snow in areas like southern Yichun, northern Harbin, and western Jiamusi, with some towns in eastern Qitaihe potentially facing blizzard conditions [2] - Rain mixed with snow is expected in Jixi, transitioning to heavy snow, while other regions will see varying degrees of snow [2] - The forecast for March 27 night to March 28 day includes light to moderate snow in eastern Jiamusi and eastern Qitaihe, with cloudy conditions and possible flurries in other areas [2] Group 3 - The minimum temperatures for the night of March 26 are forecasted to range from -20 to -18°C in northern Daxing'anling, while southern areas will see temperatures between -3 to -1°C [3] - The maximum temperatures for March 27 are expected to be between -3 to -1°C in northern Daxing'anling and eastern Jiamusi, with other regions ranging from 1 to 5°C [3] - Wind gusts of 5 to 6 levels are anticipated in the central and southern regions, leading to slippery roads and potential ice accumulation [3]