On August?25, an area of convection persisted on satellite imagery on August?25. The thunderstorms pulsed and became better organized by August?27. ^[2] That day, the Japan Meteorological Agency (JMA) ^{[nb 2]} estimated that a tropical depression formed southeast of the Japanese island of Okinotorishima , ^[3] or about 520?km (320?mi) northwest of Guam . The Joint Typhoon Warning Center (JTWC) ^{[nb 3]} also estimated a tropical cyclone formed on August?27. With a ridge to the north, the depression tracked slowly to the southwest. ^[5] The system gradually organized while developing improved outflow to the south, although a tropical upper tropospheric trough to the north caused wind shear . ^[2] On August?29, the JMA upgraded the depression to Tropical Storm Dujuan, ^[3] although the JTWC had upgraded a day prior. ^[5] That day, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) began issuing advisories as the storm approached the region, naming it Onyok. ^[1]

Shortly after it was named, Dujuan quickly intensified after an upper-level low to the northwest improved outflow to the north. ^[5] On August?30, the ridge to the north built eastward, causing the storm to slow and turn more to the northwest. ^[5] That day, an eye developed in center, ^[2] and the JMA upgraded Dujuan to typhoon status. Subsequently, the typhoon accelerated to the west-northwest and later to the west. On September?1, the JMA estimated Dujuan attained peak 10?minute sustained winds of 150?km/h (93?mph). ^[3] Around the same time, the JTWC assessed peak 1?minute winds of 230?km/h (140?mph), making it the equivalent of a Category?4 on the Saffir-Simpson hurricane wind scale . While near peak intensity, the center of Dujuan passed about 45?km (28?mi) south of the southern tip of Taiwan . ^[5] While moving westward through the South China Sea , the typhoon weakened slightly after its peak intensity due to an eyewall replacement cycle . ^[2] Radar from the Hong Kong Observatory indicated an inner eye about 20?km (12?mi) in diameter, and an outer eye about 100?km (62?mi) in diameter. ^[6] At around 1200? UTC on September?2, Dujuan made landfall just east of Hong Kong , ^[3] near Shenzhen . ^[6] The JMA estimated the typhoon had weakened into a severe tropical storm by the time of landfall, ^[3] while the JTWC estimated winds of 185?km/h (115?mph). ^[5] It was considered the strongest typhoon to strike the Pearl River Delta since Typhoon Hope in 1979. ^[7] Dujuan rapidly weakened while continuing westward through China, dissipating on September?3 over Guangxi . ^[3]

Although the center passed north of Luzon in the Philippines, Dujuan interacted with the monsoon to produce heavy rainfall over the country. Flash flooding in Metro Manila covered roads, causing traffic jams. Dangerous conditions caused many schools to close. ^[8] The typhoon destroyed one house, and one person was killed in the country. ^[9] While in the vicinity, Dujuan produced gusts of 100?km/h (62?mph) on Yonaguni , a Japanese subdivision of Okinawa . Strong winds and high waves disrupted marine and airline traffic, with two flights canceled. ^[10] Rainfall on Okinawa reached about 18?mm (0.71?in). ^[11]

On August?31, officials in Taiwan issued a sea warning, advising for boats to avoid the Bashi Channel . ^[12] Schools in southern Taiwan were closed, and transport was disrupted. The Ministry of National Defense canceled a military exercise due to the storm. ^[13] In Taiwan, the typhoon dropped heavy rainfall that reached 628?mm (24.7?in) in Pingtung County , and several other locations reported over 200?mm (7.9?in). Sustained winds reached 176?km/h (109?mph) on Orchid Island offshore southeastern Taiwan, where gale-force winds were recorded for 13?hours and gusts reached 271?km/h (168?mph). The typhoon was so strong that it destroyed the anemometer there. On the island of Taiwan, winds peaked at 87?km/h (54?mph) at Dongshi , while gusts peaked at 184?km/h (114?mph) in a mountainous region of Nantou County . ^[2] The typhoon left about 590,000?people without power at some point on the island. Transport was disrupted, and there was about NT$200?million (TWD, US$115?million). ^{[nb 4]} Dujuan killed three people and injured eight in southern Taiwan; ^[6] one was a drowning in the Penghu islands, and another occurred when a man was blown out of his window in Taipei . ^[15]

Before Dujuan made its final landfall, the Hong Kong Observatory initially issued a standby warning signal , and eventually raised it to a number?9 signal, the second-highest out of 10, for the first time since Typhoon York in 1999 . ^{[6] [16]} The threat of the storm caused 360?flights to be canceled or delayed at Hong Kong International Airport , ^[6] and the Hong Kong Stock Exchange was closed. ^[2] Officials opened 27?shelters for residents, housing over 120?people. ^[16] Winds in the territory briefly reached typhoon status, or 120?km/h (75?mph), at Lau Fau Shan . Rainfall reached over 90?mm (3.5?in) on Lantau Island . ^[6] Dujuan caused minor flooding and two small landslides In Hong Kong, the typhoon knocked down 85?trees and caused a power outage affecting 300?people in Yuen Long . Dujuan injured 24?people in the territory, ^[6] and four fishermen were missing and presumed drowned after their boat sank. ^[2] Despite the close passage, damage was minor in Hong Kong. ^[7] During the height of the storm, three people stole $1.3?million (USD) worth of jewelry, watches, and clothing from a store. ^[17]

On the Chinese mainland, Dujuan produced 183?mm (7.2?in) of rainfall in Puning in Guangdong , of which 131?mm (5.2?in) fell in 24?hours. In Fujian province, winds reached 144?km/h (89?mph) in Quanzhou , and in Guangdong, winds peaked at 179?km/h (111?mph) in Shenzhen . ^[2] In Shenzhen near where Dujuan made landfall, 90% of residents lost power, ^[6] after strong winds knocked down power lines, ^[18] although it was quickly restored. ^[7] Also in the city, 20?people were killed, ^[18] 16 of whom due to the collapse of a half-finished building that they were constructing. ^[7] Officials had opened 272?emergency shelters before the storm's arrival, housing 4,950?people. ^[19] In Huizhou , nine people were killed, and another three people died in Shanwei from the storm. ^[18] Across Guangdong, the typhoon damaged roads, water and power systems, and telecommunication networks. About 139,000?ha (340,000 acres) of crops were damaged in the province, ^[2] and 54,000?homes were destroyed. ^[20] In Macau , 30?flights were delayed at Macau International Airport , and two bridges were closed. In Fuzhou in Fujian province, the storm knocked down 500?trees. ^[2] Overall damage in China was estimated at ￥2.3?billion ( CNY , US$277?million), ^{[nb 5]} and across Guangdong, the typhoon injured about 1,000?people and killed 40?people. ^[6]

• Other tropical cyclones named Dujuan
• Other tropical cyclones named Onyok
• Typhoon Usagi (2013)
• Typhoon Dujuan (2015)

• JMA General Information of Typhoon Dujuan (0313) from Digital Typhoon
• JMA Best Track Data of Typhoon Dujuan (0313) (in Japanese)
• JMA Best Track Data (Graphics) of Typhoon Dujuan (0313)
• JMA Best Track Data (Text)
• JTWC Best Track Data of Typhoon 14W (Dujuan)
• 14W.DUJUAN from the U.S. Naval Research Laboratory