Core Viewpoint - The article discusses the onset of the "Seven Down, Eight Up" flood prevention period in Northern China, highlighting the significant rainfall and extreme weather events expected during this time [1][4][11]. Summary by Sections Rainfall Patterns - The "Seven Down, Eight Up" period typically occurs from late July to early August, during which Northern China experiences concentrated rainfall, accounting for about one-third of the annual precipitation [4][10]. - Historical data from 1991 to 2020 indicates that major cities in the region, such as Beijing, Shijiazhuang, and Jinan, receive over 50% of their annual rainfall during these two months [4][6]. Extreme Weather Events - The article references several historical extreme rainfall events, including the 2021 Zhengzhou and 2012 Beijing floods, emphasizing the potential for record-breaking rainfall during this period [6][10]. Meteorological Influences - The article identifies key meteorological factors contributing to the rainfall, including the influence of the subtropical high-pressure system, warm moist air from the sea, and cold air from Siberia, which interact to create severe weather conditions [7][10]. - The geographical features, such as the Taihang and Yanshan mountain ranges, play a significant role in enhancing rainfall as warm moist air is forced to rise and cool, leading to precipitation [10]. Forecast for Current Year - According to the National Climate Center, the forecast for this year's "Seven Down, Eight Up" period indicates above-normal precipitation in regions such as Inner Mongolia, Heilongjiang, and Shandong, with rainfall expected to be 20% to 50% higher than usual [10][11].

Group 1 - The arrival of the "Plum Rain" season is imminent, with significant rainfall expected in Zhejiang province starting from June 8, lasting approximately one month [1][2] - The current weather conditions are influenced by a strong subtropical high pressure system, which is broader than in previous years, and cold air systems that may interact with it [2] - The complexity of this year's weather patterns is highlighted, with potential for both "Plum Rain + Typhoon" scenarios or interruptions in the rainy season [2][3] Group 2 - The weather forecast indicates that from June 7 to June 10, Hangzhou may experience several strong rainfall events, coinciding with the annual college entrance examination period [3] - Precautions are advised for students during the examination days due to expected hot and humid conditions, followed by rain, emphasizing the need for hydration and rain gear [3]

Group 1 - The arrival of the "Xiaoman" solar term marks the transition to hotter weather in the Yellow River basin, while the southern regions will experience increased rainfall and rising river levels [1] - Northern regions have recently experienced a significant heatwave, with temperatures exceeding 40°C in several areas, breaking records for May [2] - Cold air is expected to bring a rapid decline in temperatures across northern regions, with drops of 10 to 20°C anticipated [2][3] Group 2 - Southern regions will also see a decrease in maximum temperatures, with areas previously above 30°C experiencing significant drops of 8 to 14°C [3] - From May 22 to 24, temperatures across many regions will shift from significantly above average to below average, prompting residents to adjust their clothing accordingly [5] - Heavy rainfall is forecasted for southern regions, particularly in the next few days, with the potential for severe weather conditions including thunderstorms and localized heavy downpours [6][8] Group 3 - The upcoming ten days will see frequent rainfall in Jiangnan and South China, with some areas experiencing rainfall amounts 1 to 2 times higher than the average for this period [10] - The proverb "Xiaoman Xiaoman, rivers gradually fill" suggests that river levels in Jiangnan and South China may continue to rise, increasing flood prevention pressures [12]

Group 1 - The weather in Hangzhou is experiencing a transition from hot and sunny conditions to a rainy pattern, with temperatures reaching up to 34°C and minimum temperatures above 20°C before the rain arrives [1][2] - The arrival of warm and humid air is expected to lead to scattered showers, with increased humidity contributing to a feeling of summer heat [2] - The interaction between warm moist air from the south and cold air from the north is causing the region to enter a rainy phase, highlighting the unpredictable nature of summer weather [2]

Core Points - On April 12, significant strong convective weather occurred in most parts of Guangdong, with moderate to heavy rain in the central and northern counties, and local heavy rain in other areas [1][3] - Wind speeds reached levels of 7 to 9, with localized gusts of 10 to 12, affecting most counties except for the southwestern regions [1][3] - The weather forecast predicts sunny to partly cloudy conditions from April 13 to 15, with temperatures expected to drop by 3 to 6 degrees Celsius due to cold air influence [5][6] Weather Conditions - From 8 AM to 5 PM on April 12, nine towns recorded over 50 mm of rainfall, while 222 towns recorded between 25 mm to 50 mm of heavy rain [3] - The highest recorded rainfall was 61.6 mm in Heyuan and 60.1 mm in Shaoguan [3] - Wind speeds included gusts exceeding 24.5 m/s (10-level wind) at eight meteorological stations, and 20.8 m/s to 24.5 m/s (9-level wind) at 59 stations [3] Temperature Changes - The maximum temperatures in southwestern counties increased by 1 to 2 degrees Celsius compared to April 11, while other areas saw a decrease of 1 to 4 degrees Celsius [3][4] - The highest temperature recorded was 33.7 degrees Celsius in Zhanjiang [4] Future Weather Forecast - The forecast for April 13 to 15 indicates mostly sunny weather, with minimum temperatures ranging from 10 to 14 degrees Celsius in northern Guangdong and 18 to 20 degrees Celsius in the western counties [5] - On April 15, the minimum temperatures are expected to be between 11 to 14 degrees Celsius in northern Guangdong and 17 to 20 degrees Celsius along the western coast [5] Marine Weather Conditions - A marine wind forecast indicates north winds of 6 to 8 levels with gusts of 9 to 10 levels on the night of April 12, transitioning to northeast winds of 5 to 7 levels during the day on April 13 [6] - The weather department advises caution for coastal tourism, marine operations, and transportation safety due to strong winds [6]