Typhoon Co-may

This article is about the 2025 typhoon. For other storms of the same name, see List of storms named Emong.

Typhoon Co-may (Emong)

File:Co-may 2025-07-24 0507Z.jpg Co-may intensifying to the west of Northern Luzon on July 24
Meteorological history
Formed	July 23, 2025 (2025-07-23)
Typhoon
10-minute sustained (JMA)
Highest winds	120 km/h (75 mph)
Lowest pressure	975 hPa (mbar); 28.79 inHg
Category 1-equivalent typhoon
1-minute sustained (SSHWS/JTWC)
Highest winds	130 km/h (80 mph)
Lowest pressure	975 hPa (mbar); 28.79 inHg
Overall effects
Areas affected	Philippines Ryukyu Islands
Part of the 2025 Pacific typhoon season

Typhoon Co-may, known in the Philippines as Typhoon Emong, is a weakening tropical cyclone currently traversing the Ryukyu Islands after recently making landfalls in the Philippine provinces of Pangasinan and Ilocos Sur. The eighth named storm and the second typhoon of the annual typhoon season, Co-may is the strongest typhoon to make landfall in Pangasinan since Chan-hom of 2009 and one of only four storms to do so.

Co-may originated from a low-pressure area southwest of the Calayan Group of Islands on July 23. Due to the system being present in the Philippine Area of Responsibility (PAR), PAGASA named the depression Emong on the same day. The storm quickly moved through Balintang Islands and sharply tracked west-southwestwards 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). Co-may 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.

Meteorological history

File:Co-may 2025 path.png

Map plotting the track and the intensity of the storm, according to the Saffir–Simpson scale

During mid-July, an area of low pressure was detected northeast of Ilocos Norte by the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA). Initially, it was not expected to develop into a tropical cyclone. However, by July 22, the system began to show signs of organization as it moved westward between the Calayan Group of Islands and the northern coast of Ilocos Norte. Around this time, the Joint Typhoon Warning Center (JTWC) also began monitoring the system, designating it as Invest 99W.

Later that day, PAGASA raised the probability of cyclone formation to “high,” and within a few hours, the disturbance intensified into a tropical depression, receiving the local name Emong. The JTWC also issued a Tropical Cyclone Formation Alert (TCFA), citing a high likelihood of tropical cyclogenesis in the coming days. Soon after, the JTWC upgraded the system to a tropical depression, assigning it the designation Tropical Depression 11W.

Meanwhile, the Japan Meteorological Agency (JMA) also recognized the system as a tropical depression a few hours later. By this time, however, both PAGASA and JTWC had already classified the system as a tropical storm. JMA subsequently followed suit, upgrading it to tropical storm status and assigning it the international name Co-may. The storm then turned west-southwestward toward the northwestern tip of Pangasinan. Rapid intensification occurred overnight. By the morning of July 24, Co-may was upgraded to a severe tropical storm by both PAGASA and JMA, and later in the day, it reached minimal typhoon strength according to both PAGASA and the JTWC. The storm then altered its course, turning southeastward toward the area between Pangasinan and La Union.

On July 24, the JMA also upgraded Co-may to typhoon status. Then at 22:40 PHT (14:40 UTC), Co-may made its first landfall over Agno, Pangasinan, bringing strong winds and heavy rainfall. This made Co-may the most powerful typhoon to strike Pangasinan since Chan-hom in 2009. After landfall, the interaction with the mountainous terrain of the Cordillera Range weakened it into a severe tropical storm as it moved northeastward. Co-may later made its second landfall over Candon, Ilocos Sur at 05:10 PHT (21:10 UTC).

Preparations

Philippines

Shortly after the system was named by PAGASA, the agency issued Tropical Cyclone Wind Signal #1 over Ilocos Norte, the northwestern portion of La Union, and the western portion of Pangasinan, due to the depression’s proximity to northern Luzon. As the system rapidly intensified into a severe tropical storm, PAGASA subsequently raised Signal #3 over the entire province Abra, Apayao, Ilocos Norte, central portion of Pangasinan, extreme northern portion of Zambales, northern and western portion of Cagayan, western portion of Benguet; Kalinga; and Mountain Province, as well as the remaining areas of the provinces that were placed in Signal #4. Signal #2 was later hoisted over the entire provinces of Babuyan Islands, Batanes, Ifugao, as well as the northern portion of Tarlac and Zambales, northern and western portions of Isabela, northwestern portion of Nueva Ecija and Quirino, and the western and central portions of Nueva Vizcaya. This signal also covered the remaining areas already placed under Signal #3.

Meanwhile, Signal #1 was raised over the northern portion of Bataan, northern and central portions of Aurora, western and central portions of Pampanga and the remaining localities of each province that were previously placed under Signal #2. Classes in Metro Manila and in some areas in Luzon and Western Visayas were suspended from July 24 and 25 due to Co-may and the enhanced southwest monsoon.

When Co-may was upgraded into a typhoon by the PAGASA at 11:00 PHT (03:00 UTC), a Signal #4 warning was issued over the northern portion of Pangasinan, the northern and central portions of La Union, and the southwestern portion of Ilocos Sur. All storm signal warnings were later discontinued on July 26.

Impact

Philippines

Co-may generated strong winds and floods in parts of the Philippines, resulting in extensive damage in Alaminos, Pangasinan and Naval Station Ernesto Ogbinar in San Fernando, La Union. Five people were rescued from floods in Burgos, Ilocos Norte. Flooding also blocked a highway in Bauang, La Union. A widespread power outage occurred in Baguio and nearby areas in Benguet at around 02:00 PHT (18:00 UTC) on July 25 as Co-may battered the Cordillera Central mountain range. Many provinces in Luzon and Visayas were placed under a state of calamity due to the severe damages caused by Co-may, including the effects of the southwest monsoon.

See also

• Weather of 2025
• Tropical cyclones in 2025
• Typhoons in the Philippines

Other similar tropical cyclones:

• Typhoon Flo (Kadiang; 1993)
• Typhoon Vicki (Gading; 1998)
• Tropical Storm Linfa (Chedeng; 2003)
• Tropical Storm Halong (Cosme; 2008) – a tropical storm that also followed a similar trajectory.
• Typhoon Chan-hom (Emong; 2009) – a typhoon with the same Philippine name which followed a similar trajectory.
• Typhoon Parma (Pepeng; 2009)

External links

This article "Typhoon Co-may" is from Wikipedia. The list of its authors can be seen in its historical and/or the page Edithistory:Typhoon Co-may. Articles copied from Draft Namespace on Wikipedia could be seen on the Draft Namespace of Wikipedia and not main one.

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