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 weather in Hangzhou has shown a drastic change from hot to cool, highlighting the significant impact of humidity on comfort levels [1] - On Sunday, the temperature was pleasant due to the influence of cold air, with thick cloud cover and occasional light rain, making it one of the most comfortable days recently [1] - However, temperatures are expected to rise again on Monday, reaching around 33°C in the afternoon, signaling the return of early summer heat [1] Group 2 - Starting Tuesday, warm and humid air will return, leading to a series of rain events in Hangzhou, with a focus on thunderstorms and heavy rain from Tuesday to Saturday [1] - The upcoming weather pattern resembles a rehearsal for the plum rain season, prompting residents to stay updated on weather forecasts and prepare for both sun and rain [2] - Recommendations include carrying an umbrella, staying hydrated, consuming light meals, and using air conditioning or fans to manage indoor temperature and humidity [2]

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]