Before, during and after the quasi-static front crossing

Quasi-static front-concept: a front with equal strength of cold and warm air masses.

The rising state of a heated substance-sliding slowly upward.

Weather characteristics-before crossing the border: controlled by a single air mass, the weather is fine; When crossing the border: the warm air mass rises or climbs in balance, forming continuous precipitation; After crossing the border: single air mass control, sunny weather.

Weather example: Meiyu season in Jianghuai area, Kunming static front in Yunnan-Guizhou Plateau.