北京等地为何出现同期少见 “被牛舔”式闷热？还将持续多久？

Group 1 - Recent humid and hot weather in Beijing and other northern cities has been unusual for this time of year, leading to comparisons with southern cities like Guangzhou [1][3] - The high humidity levels in Beijing reached 91% with a temperature of 27°C, while Guangzhou had a temperature over 30°C and a relative humidity of 77%, indicating similar discomfort levels [1] - The phenomenon is attributed to the strengthening of the subtropical high pressure system, which has brought moist tropical air to northern regions [3] Group 2 - Meteorologist Sun Qianqian noted that such hot and humid conditions in northern cities are typically seen during the major heat period, but this year they have arrived earlier than usual [5] - The hot and humid weather is expected to persist for at least another week, prompting recommendations for the public to use air conditioning, stay hydrated, and wear light clothing [5]