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Severe Tropical Storm Prapiroon (Butchoy)

Tropical Storm Prapiroon at peak intensity, approaching Vietnam on July 22
Meteorological history
Formed	July 19, 2024
Dissipated	July 24, 2024
Severe tropical storm
10-minute sustained (JMA)
Highest winds	110 km/h (70 mph)
Lowest pressure	980 hPa (mbar); 28.94 inHg
Tropical storm
1-minute sustained (SSHWS/JTWC)
Highest winds	110 km/h (70 mph)
Lowest pressure	980 hPa (mbar); 28.94 inHg
Overall effects
Fatalities	20 total
Missing	10
Damage	$412,729 (2024 USD)
Areas affected	Philippines, Vietnam, South China (particularly Hainan and Guangxi), Thailand, Cambodia
IBTrACS /
Part of the 2024 Pacific typhoon season

Severe Tropical Storm Prapiroon, known in the Philippines as Tropical Depression Butchoy was a compact tropical cyclone that made landfall in Hainan and Vietnam in July 2024. The fourth named storm of the 2024 Pacific typhoon season, the system was first noted by the Joint Typhoon Warning Center (JTWC) as an area of convection east of the Philippines on July 15. After crossing the Philippines and exiting into the South China Sea, the disturbance quickly organized into a tropical depression and was giving the local name Butchoy by the PAGASA on July 19. After exiting PAGASA's area of responsibility on July 21, the depression intensified into a tropical storm and was given the international name Prapiroon by the Japan Meteorological Agency (JMA). The storm crossed the island of Hainan and entered the Gulf of Tonkin, where it intensified into a severe tropical storm on July 22 before making landfall in Quảng Ninh province, Vietnam. Prapiroon rapidly weakened inland as the JTWC issued its final warning the following day, and the JMA downgraded it to a tropical depression.

Meteorological history

On July 15, the United States Joint Typhoon Warning Center (JTWC) started to monitor a persistent area of convection roughly 623 nautical miles (717 mi; 1,154 km) southeast of Manila, Philippines. At that time, the disturbance was in a favorable environment for development, with warm 29–30 °C (84–86 °F), sea surface temperatures, low wind shear and good equatorial outflow. At 06:00 UTC the same day, the JMA designated the system as a low-pressure area. Several days later, the low crossed into the South China Sea. On July 19, the JTWC gave a Tropical Cyclone Formation Alert to the disturbance, citing a high chance of development within 24 to 48 hours. Shortly after, the JMA designated it as a tropical depression.

PAGASA followed suit a few hours later, recognizing the system as a tropical depression and naming it Butchoy. Soon after, the JTWC designated the system as Tropical Depression 04W. However, the next day, Butchoy exited the PAR, causing PAGASA to stop tracking the system. Early on July 21, Butchoy intensified into a tropical storm, being named Prapiroon by the JMA. Later that day, Prapiroon made landfall near Wanning, Hainan with 1-minute sustained winds of 55 kn (65 mph; 100 km/h). Early the next day, Prapiroon intensified into a severe tropical storm. At 6:30 am PT that same day, Prapiroon made its second landfall in Quảng Ninh, Vietnam. Rapidly weakening, early the next day, the JTWC stopped tracking Prapiroon. The system weakened into a tropical depression by the JMA that same day.

Preparations and impact

Philippines

Along with Typhoon Gaemi, Prapiroon and its precursor influenced the southwest monsoon over the Philippines, producing heavy rainfall over parts of the archipelago from July 12 through July 20, when Prapiroon began to move away from the Philippines. A total of 866,483 people were affected by the storm across the Mimaropa, Caraga, and Bangsamoro. About 33,645 people were evacuated to emergency shelters. There were 94 damaged residences in Mimaropa, of which, 10 were completely destroyed. A total of 73 sections of road were damaged and five bridges were damaged, while seven roads and a bridge were inaccessible. In Mindanao, a total of 179,744 households were impacted by heavy rainfall. Seven fatalities were reported: four in Zamboanga, and one each in Bangsamoro, Davao, and Northern Mindanao. Across these regions, 236 homes were damaged, with losses totaling ₱2.57 million (US$43,948). Infrastructural damage totaled ₱8.75 million (US$149,500). Significant damage to agriculture also occurred, with 396.4 metric tons (437 US tons) of damage incurred to crops and other agricultural products by a total of 748 farmers and fishermen. Total losses across the Philippines reached ₱20.33 million (US$412,729.47) and eight fatalities were reported. Following the storm, about ₱29 million (US$496,173) worth of aid was distributed to 23,157 affected households. A state of calamity was declared in the municipalities of Cotabato and Kabacan.

China and Hong Kong

Prior to its landfall, The China Meteorological Administration, issued typhoon and rain warnings along Hainan and Guangdong. A Level 3 out of 4 emergency response alert was issued in Guangxi, as well as a yellow typhoon alert. About 26,000 visitors on Weizhou Island were evacuated prior to the storm through the use of ferries. High-speed rail and ferry services on the island of Hainan were cancelled. All vessels in Hainan were ordered to return to port and offshore workers were allowed to seek shelter on the island. A flood control team was sent to Hainan in preparation for flooding. A No. 1 Typhoon warning signal was issued by the Hong Kong Observatory for Hong Kong, from the afternoon of July 20 to noon on July 22.

As Prapiroon made landfall in Hainan, twelve counties and cities on the island received rainfall in excess of 100 mm (4 in). The highest sustained wind measured on Hainan was 137 km/h (85 mph) in Wanning, where the storm made landfall. High winds were reported in Guangxi, reaching a peak of 89 km/h (55 mph) in Beihai. Torrential rainfall also impacted the province with a maximum accumulation of 38.3 mm (1.5 in) in Donglan County. Rain squalls impacted the Pearl River Delta, where occasional high wind gusts were reported in elevated parts of Hong Kong.

Vietnam

Before Prapiroon approached Vietnam, Prime Minister of Vietnam Phạm Minh Chính ordered emergency measures to take place in coastal provinces. Vessels were ordered to return to port or move away from areas within the storm's projected track. Emergency response teams were deployed to protect traffic moving through flood and landslide-prone areas and assist in evacuation and recovery efforts. Measures were also taken to prevent dams and reservoirs from overflowing. Heavy rainfall was expected in Northern Vietnam, reaching as high as 300 mm (12 in) in parts of Thanh Hóa province.

As the storm landed in Quảng Ninh, Prapiroon became the first tropical cyclone to strike Vietnam in 640 days, ending a record drought of landfalls. The storm downed trees and damaged billboards and fences in the province of Quảng Ninh. Heavy rain and flooding in Sơn La Province killed five people, and four others were missing, as of July 24.

Prapiroon brought significant agricultural impact to Vietnam. In the Cà Mau province and the Hậu Giang province, over 1,000 hectares of rice were damaged due to the heavy rains caused by Prapiroon. In the Trần Văn Thời district, 570 hectares of rice were damaged.

Elsewhere

In Thailand, the remnants of Prapiroon caused heavy monsoonal rains in some parts of the country. People were advised to be alert for dangers such as flash flooding and landslides. The combination of moisture from Prapiroon and Typhoon Gaemi produced severe thunderstorms across Cambodia, which resulted in strong winds, heavy rainfall, and lightning. A large tree fell onto a tuk-tuk in Siem Reap, killing five people and injuring four others. Local authorities cleared the scene of debris and were ordered to control traffic in an effort to prevent further vehicular incidents.

See also

• Weather of 2024
• Tropical cyclones in 2024
• Other storms of the same name
• Tropical Storm Kujira (2015)
• Tropical Storm Sinlaku (2020)
• Tropical Storm Nangka (2020)
• Tropical Storm Lionrock (2021)

References

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External links

• Pending AfC submissions
• Pending AfC submissions in article space