Group 1 - The weather in Hangzhou experienced a dramatic shift with a maximum temperature of 37.5°C followed by thunderstorms and heavy rain due to a clash of cold and warm air masses [1] - The Zhejiang Meteorological Bureau explained that the weather pattern was influenced by a typical "bowl-shaped" distribution of high and low pressures, leading to increased chances of strong convective weather [1] - The forecast indicates that thunderstorms will continue in Hangzhou, with potential for short-term heavy rain and strong winds [1] Group 2 - The influence of high-pressure systems is diminishing, leading to a decrease in high temperatures and increased humidity in Hangzhou [2] - The development of Typhoon "Wipha" is expected to impact the region, with potential for multiple typhoons to approach the coast [2] - The forecast suggests that the next typhoon may target areas including Taiwan, Fujian, and Zhejiang, although the timing remains uncertain [2]