Group 1 - The subtropical high pressure is weakening, leading to temporary relief from high temperatures in Hangzhou, with maximum temperatures expected to drop to 34℃-35℃ [1] - Thunderstorms and strong convective weather are anticipated due to accumulated unstable energy in the atmosphere, with warnings for short-term heavy rain and strong winds [1] - The high temperature record in Hangzhou has reached 30 consecutive days, marking the second longest heatwave in observation history [2] Group 2 - A rebound in high temperatures is expected starting Thursday, with temperatures potentially reaching 37℃-40℃ across the province [2] - The summer of 2023 has been recorded as the hottest since 1961, with an average national temperature of 22.31℃ [2] - Hangzhou's high temperature streak is only surpassed by the 35-day streak from July 20 to August 23, 2022 [2]

Group 1 - The clear blue sky in Hangzhou on August 28 is attributed to the strong subtropical high pressure, which prevents moisture from rising and forming clouds [2] - The subtropical high pressure leads to a significant increase in temperature, enhancing the air's capacity to hold moisture, resulting in a cloudless sky [2] - Hangzhou has experienced a record-breaking 26 consecutive days of high temperatures from August 3 to 28, marking the highest number of hot days in August's history [2] Group 2 - The weather pattern is expected to remain hot and sunny under the influence of the subtropical high pressure, but a weakening of this system is anticipated starting August 31 due to the impact of a westerly trough [2] - After September 1, the intensity of high temperatures is projected to decrease, with maximum temperatures dropping to between 35°C and 37°C [2] - Residents are advised to take precautions against heat and potential severe weather, including localized heavy rainfall and thunderstorms [2]

Summary of Key Points Core Viewpoint - The recent continuous rainfall in Guangdong has raised questions among residents regarding its intensity, causes, and duration, with significant weather warnings issued across the region [2][3]. Group 1: Rainfall Intensity - Shenzhen issued a citywide red rainstorm warning for the first time since Typhoon "Mangkhut" in 2018, indicating severe weather conditions [3]. - Hong Kong recorded 355.7 millimeters of rain on August 5, breaking the record for the highest daily rainfall in August since 1884 [3]. - Over a 24-hour period, 28 towns in Guangdong experienced extreme rainfall, with the highest recorded at 470.6 millimeters in Huizhou [5]. Group 2: Causes of Rainfall - The rainfall is attributed to a combination of uplift mechanisms and abundant moisture, with a cold vortex acting similarly to a typhoon, creating strong upward motion and drawing in moisture [6][8]. - The southwest monsoon has been a significant contributor, bringing warm, moist air into Guangdong, which, combined with the cold vortex, has led to persistent heavy rainfall [8][10]. Group 3: Comparison with Northern Rainfall - The rainfall in Guangdong differs from that in northern regions, as the latter is influenced by cold air masses and warm moist air converging, while Guangdong's rain is more akin to typhoon rain mechanisms [10][11]. Group 4: Future Weather Outlook - The cold vortex is expected to move out of Guangdong, leading to a decrease in rainfall intensity as the subtropical high pressure pushes the system northward [14]. - After the rain subsides, temperatures in Guangdong are anticipated to rise, transitioning to a hot and humid weather pattern [15][17].