Why does the same typhoon make multiple landfalls? Experts analyze the formation conditions.

Typhoon "Wipha", the sixth typhoon of this year, made landfall again this morning along the coast of Vietnam's Gulf of Tonkin. Including its two previous landfalls in Guangdong Province, China, this is its third landfall. What conditions are needed for the same typhoon to make multiple landfalls? What factors may contribute to a typhoon making multiple landfalls? Experts say that, first of all, meteorological factors such as the strength and position of the subtropical high pressure, the direction of the low-level jet stream, and sea surface temperatures can influence the path and intensity of a typhoon. When a typhoon approaches land, if it encounters favorable meteorological conditions such as suitable sea temperatures and low-level air flow, it may strengthen and make landfall again. In addition, the impact of terrain on a typhoon should not be underestimated. After its first landfall, a typhoon may change its path due to the influence of terrain, leading to another landfall. Terrain such as mountains and rivers can change wind direction and speed, thereby affecting the typhoon's movement. Furthermore, cold air can also have an impact on a typhoon. After a typhoon makes landfall, it typically carries a large amount of warm and moist air. If cold air from the north moves southward at this time, the convergence of cold and warm air masses can trigger more intense convection and rainfall, potentially causing the typhoon to make landfall again. Typhoon "Wipha" this year has been influenced by multiple factors, making two landfalls in China. Although its intensity at landfall was not very strong, it still brought significant winds and rains to Guangdong, Guangxi, Guizhou, and Hunan provinces.