Tropical Storm Co-May

Severe Tropical Storm Co-May (transliterated from Vietnamese Cỏ May), known in the Philippines as Typhoon Emong, was an impactful and erratic tropical cyclone that affected the Philippines, specifically Ilocos Region and East China in late July 2025. The eighth named storm of the 2025 Pacific typhoon season, Co-May is the strongest system to make landfall in Pangasinan since Typhoon Chan-hom in 2009 and one of only four storms to do so.

Co-May originated from a low-pressure area southwest of Calayan, Cagayan on July 23. Due to the system being present in the Philippine Area of Responsibility (PAR), the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) named it Emong on the same day. The depression quickly moved through Balintang Islands and sharply tracked west-southwestward due to a Fujiwhara interaction with the nearby Tropical Storm Francisco, which was situated northeast of Luzon.

Later that day, the system was upgraded to a tropical storm and was given the name Co-May by the Japan Meteorological Agency (JMA), which refers to a Vietnamese grass (Chrysopogon aciculatus), and also the replacement name for Lekima. The storm then moved southwestward, as it was situated in the eastern semicircle of a monsoon gyre. The storm would later rapidly intensify into a minimal, Category 1-equivalent typhoon on the Saffir–Simpson scale, with one-minute sustained winds of 120 km/h (75 mph). As it approached the southwestern edge of the gyre, Co-May altered its course and began tracking more southeastward after passing the inflection point. The system slightly weakened before it made landfall over Agno, Pangasinan during the night of July 24. Early on the following day, Co-May gradually weakened further as its outer bands crossed the rugged terrain of the Cordillera Range, and was downgraded to a severe tropical storm by the time of its second landfall over Candon City, Ilocos Sur.

The storm weakened into a tropical depression after passing through the mountains of the Cordillera. However, it regained tropical storm status over the Ryukyu Islands despite the marginal environment. Co-May made two additional landfalls in China: one on Zhujiajian Island, Zhejiang on July 29, and another in Fengxian District, Shanghai on July 30. Co-May then weakened into a remnant low before dissipating on August 3.