Typhoon Co-may

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Saffir–Simpson scale
  Tropical depression (≤38 mph, ≤62 km/h)
  Tropical storm (39–73 mph, 63–118 km/h)
  Category 1 (74–95 mph, 119–153 km/h)
  Category 2 (96–110 mph, 154–177 km/h)
  Category 3 (111–129 mph, 178–208 km/h)
  Category 4 (130–156 mph, 209–251 km/h)
  Category 5 (≥157 mph, ≥252 km/h)
  Unknown
Storm type
Disc Plain black.svg Tropical cyclone
Solid black.svg Subtropical cyclone
ArrowUp.svg Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

In mid-July, PAGASA began monitoring an area of low pressure northeast of Ilocos Norte. The system started to organize on July 22 as it moved westward, prompting the Joint Typhoon Warning Center (JTWC) to designate it as Invest 99W. Later that day, PAGASA declared that the probability of cyclone formation was "high", and the disturbance intensified into a tropical depression, receiving the local name Emong. [1] Concurrently, the JTWC issued a Tropical Cyclone Formation Alert (TCFA), citing high probability for tropical cyclogenesis before upgrading the system to a tropical depression and designated it 11W. [2] The JMA also classified the system as a tropical depression shortly thereafter. By this time, however, both PAGASA and the JTWC had already upgraded 11W to a tropical storm. The JMA followed suit, assigning it the international name Co-may, the replacement name for the retired name Lekima following the 2019 season. The storm then turned west-southwestward towards the northwestern tip of Pangasinan. After undergoing rapid intensification overnight, Co-may was upgraded to a severe tropical storm by both PAGASA and the JMA on the morning of July 24. Later in the day, PAGASA and the JTWC announced that it reached typhoon intensity. The storm then altered its course, turning southeastward towards the area between Pangasinan and La Union.

Subsequently, the JMA also upgraded Co-may to a typhoon. Then at 22:40 PHT (14:40 UTC), it made its first landfall in Agno, Pangasinan, bringing strong winds and heavy rainfall. [3] This made Co-may the most powerful typhoon to strike the province since Chan-hom in 2009. [4] Post-landfall interaction with the mountainous terrain of the Cordillera Central caused Co-may to weaken into a severe tropical storm as it tracked northeast. The system made a second landfall in Candon, Ilocos Sur, at 05:10 PHT on July 25 (21:10 UTC, July 24). [5] Co-may continued to weaken as it moved over the Babuyan Channel [6] and was downgraded to a tropical depression [7] as it passed through the Ryukyu Islands.

On July 27, all monitoring agencies re-upgraded Co-may to a tropical storm as it tracked near Okinawa. The storm then turned westward towards China, where it made another landfall on Zhujiajian Island, Zhejiang on July 29 and in Fengxian District, Shanghai on July 30. It weakened into a remnant low over land on July 31[ citation needed ] and its remnants passed through Yancheng and tracked across the Yellow Sea before dissipating over South Korea on August 3.

Preparations

Philippines

In anticipation of Co-may (known locally as Emong), PAGASA began issuing Tropical Cyclone Wind Signals. Signal #1 was initially hoisted over Ilocos Norte, the northwestern portion of La Union, and the western portion of Pangasinan due to the system's proximity to northern Luzon. [8]

As the system rapidly intensified into a severe tropical storm, PAGASA subsequently raised Signal #3 over the entire provinces of Abra, Apayao, Ilocos Norte, Kalinga and Mountain Province. This signal also covered the central portion of Pangasinan, the extreme northern portion of Zambales, the northern and western portions of Cagayan, western portion of Benguet, 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. [9]

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. [10] [11] Around 70 domestic and international flights were cancelled as Co-may nears Northern Luzon and the persistent heavy rain brought by the southwest monsoon. [12]

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 the storm signal warnings were later discontinued on July 26. [13] [14]

Impact

Philippines

Recent tropical cyclone activity from Wipha and Co-may in Southeast Asia ECDM 20250724 TC WIPHA.pdf
Recent tropical cyclone activity from Wipha and Co-may in Southeast Asia

Co-may generated strong winds and floods in parts of the Philippines, resulting in extensive damage in Alaminos, Pangasinan [15] and Naval Station Ernesto Ogbinar in San Fernando, La Union. Five people were rescued from floods in Burgos, Ilocos Norte. [16] Flooding also blocked a highway in Bauang, La Union. [17] A widespread power outage occurred in Baguio and nearby areas in Benguet at around 02:00 PHT on July 25 (18:00 UTC on July 24) as Co-may battered the Cordillera Central mountain range. [18] 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. [19] In Calumpit, one person was killed due to flooding and incessant rains. Some portions of the area saw water reach 4 feet (1.2 m) high. Two people were electrocuted after touching a live electrical wire amid the storm. [20] In Navotas, a navigational guide keeping water from overflowing the Navotas River was severely damaged. A sea wall in one of the city's barangays collapsed due to the storm, causing major flooding. [21]

China

Co-may brought torrential rainfall and strong winds to eastern China, resulting in evacuations and widespread transport disruptions in Shanghai and the provinces of Zhejiang and Jiangsu, which experienced the most severe effects of the storm. On the afternoon of 30 July, the Shanghai Meteorological Bureau issued an orange rainstorm warning, the second-highest level in China's four-tier warning system. A total of 640 flights were cancelled, including 410 at Shanghai Pudong International Airport and 230 at Shanghai Hongqiao International Airport. [22] Approximately 283,000 people were evacuated from coastal and low-lying areas as Co-may made its first landfall. [23]

See also

Other similar tropical cyclones:

References

  1. ↑ "INQToday: LPA develops into Tropical Depression Emong; Dante now a tropical storm". INQUIRER.net. July 23, 2025. Retrieved July 23, 2025.
  2. ↑ "'Emong' intensifies into tropical storm alongside 'Dante'". Manila Standard. July 23, 2025. Retrieved July 24, 2025.
  3. ↑ "Emong makes landfall over Agno, Pangasinan; Signal No. 4 over 3 areas". GMA News. July 24, 2025. Retrieved July 24, 2025.
  4. ↑ Speta, Robert (July 25, 2025). "Typhoon Emong (Co-May) Makes Landfall in Northwestern Luzon, Strongest Storm in Region in 16 Years". westernpacificweather.com. Retrieved August 11, 2025.
  5. ↑ "Emong makes second landfall in Ilocos Sur, weakens into severe tropical storm". Rappler . July 25, 2025. Retrieved July 25, 2025.
  6. ↑ "'Emong' weakens further, to pass Batanes, Babuyan Islands". The Philippine Star . July 25, 2025. Retrieved July 25, 2025.
  7. ↑ "Emong weakens into tropical depression, exits PAR". Rappler . July 26, 2025. Retrieved July 26, 2025.
  8. ↑ "Signal No. 1 raised in Ilocos, La Union, Pangasinan due to 'Emong'". Philstar . July 23, 2025. Retrieved July 24, 2025.
  9. ↑ "'Emong' almost stationary; more N. Luzon areas under Signal No. 3". Philippine News Agency . July 24, 2025. Retrieved July 24, 2025.
  10. ↑ "Class suspensions for Thursday, July 24, 2025". GMA News . July 23, 2025. Retrieved July 24, 2025.
  11. ↑ "Walang Pasok: LGUs suspend classes on July 25 due to Typhoon Emong". Inquirer . July 23, 2025. Retrieved July 24, 2025.
  12. ↑ "Philippines shuts schools, scraps flights as Typhoon Co-May nears". Yahoo News. July 24, 2025. Retrieved August 7, 2025.
  13. ↑ "Emong maintains strength, to make second landfall; Signal No. 4 remains over 3 areas". GMA News . July 25, 2025. Retrieved July 25, 2025.
  14. ↑ "'Emong' exits PAR, but southwest monsoon continues to bring rains". SunStar. July 26, 2025. Retrieved July 27, 2025.
  15. ↑ "Alaminos City hit hard by 'Emong' – police". Manila Bulletin . July 26, 2025. Retrieved July 26, 2025.
  16. ↑ "PH Navy base in La Union severely damaged but troops press on with relief efforts for typhoon victims". Manila Bulletin . July 26, 2025. Retrieved July 26, 2025.
  17. ↑ "National highway sa Bauang, La Union, binaha dahil sa Bagyong Emong". ABS-CBN (in Tagalog). July 26, 2025. Retrieved July 26, 2025.
  18. ↑ "Emong maintains strength, to make second landfall; Signal No. 4 remains over 3 areas". GMA News . July 25, 2025. Retrieved July 25, 2025.
  19. ↑ "LIST: Provinces, cities, municipalities under state of calamity". Philstar . July 25, 2025. Retrieved July 27, 2025.
  20. ↑ Reyes-Estrope, Carmela (July 26, 2025). "3 die amid floods, storm in Bulacan town". INQUIRER.net. Retrieved July 30, 2025.
  21. ↑ Gita-Carlos, Ruth Abbey (July 26, 2025). "Marcos inspects damaged navigational gate, evac center in Navotas". INQUIRER.net. Retrieved July 30, 2025.
  22. ↑ "Typhoon Co-may brings strong winds, rainfall". China Daily. July 31, 2025. Retrieved August 7, 2025.
  23. ↑ "Shanghai evacuates 283,000 people as Typhoon Co-May hits". Hong Kong Free Press. July 30, 2025. Retrieved August 7, 2025.

Notes

  1. ↑ transliterated from Vietnamese Cỏ May
Typhoon Co-may (Emong)
Co-may 2025-07-24 0507Z.jpg
Co-may intensifying to the west of Northern Luzon on July 24
RankEventDate(s)Deaths
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • May 28 – present
  • June 26 – mid-July
  • May 28–29
  • July 4–5
  • June 10–11
  • June 26 – August 7
  • May 29–30
  • August 14
  • July 16–23
  • March 26 – early April
  • 2,188 – 2,300+
  • 655+ (+209 missing)
  • 500+ (+600 missing)
  • 135+ (+3 missing)
  • 103
  • 98 (+63 missing)
  • 65
  • 65+ (+~250 missing)
  • 56 (+20 missing)
  • 55+
Death tolls come from various meteorological agencies.
See Weather of 2025#Deadliest events for the sources to this information.
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