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Typhoon Doksuri

Pacific typhoon in 2023

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Typhoon Doksuri (Egay) of the 2023 Pacific typhoon season near its peak intensity while off the coast of Luzon during the afternoon of July 25, 2023. It had 10-min sustained winds of 175 km/h (110 mph
NOAA, VIIRS on NOAA-20 satellite · Public domain

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The fifth named storm and third typhoon of the inactive 2023 Pacific typhoon season, Doksuri started as a low-pressure area in the Philippines, far off the eastern coast of Mindanao. Tracking northwestward, it rapidly intensified into a typhoon over the Philippines prior to making landfall over the Babuyan Islands. Together with the southwest monsoon, Doksuri showered most of the northern and central Luzon island with heavy rains, triggering floods in various regions of the country. Doksuri steadily weakened after interacting with land, but by late July 27, Doksuri underwent another round of rapid intensification in the South China Sea. Doksuri moved towards Fujian, China, before rapidly weakening overland, and Doksuri dissipated early on the next day.

Doksuri left behind a trail of severe destruction in its wake. The typhoon killed 137 and left 289 people injured, 27 of which were on board the MB Aya Express when the pump boat capsized. Floods were reported in 9 out of the Philippines' 17 regions, affecting over 2 million people and requiring over 300,000 to evacuate. The typhoon's close proximity and large influence to Taiwan caused around 150,000 people to lose power. The storm affected over 724,600 people and 262.3 ha (648 acres) of farmland in China's southeastern province of Fujian; 44 houses were damaged, with 178 houses completely destroyed.

In Fujian, the rainfall set records for 24-hour totals, including an accumulation of more than 648 mm (25.5 in). Torrential rains impacted many areas, with accumulations in Xiamen, Quanzhou and Putian reaching 50 mm (2.0 in). The remnants of the storm produced heavy rainfall in Beijing. The remnants dropped up to 744.8 mm (29.32 in) of rainfall in Wangjiayuan Reservoir in Changping District with Doksuri setting maximum rainfall records since recordkeeping began during the Qing dynasty in 1883, part of a trend which the heaviest rainfall events in Northern China occurred with typhoons. Overall, Doksuri caused US$28.5 billion worth of damages across the four countries affected by the typhoon. Following the extensive damage it caused in the Philippines and China, both names were retired after the season. They were replaced with Emil and Bori for future seasons.

Meteorological history

On July 19, the Japan Meteorological Agency (JMA) began tracking a low pressure area in the Philippine Sea, east of Mindanao. The agency noted its formation into a tropical depression by July 20; the Joint Typhoon Warning Center (JTWC) released a Tropical Cyclone Formation Alert later that day. The system maintained its intensity over the following day as it tracked further northwestward. On July 21, the system intensified into a tropical storm and was immediately named Doksuri; the Philippine meteorological agency PAGASA also noted the storm's formation and locally named it Egay. It was then designated by JTWC as the newly formed tropical depression 05W. Driven by a deep-layer subtropical ridge to its north, the storm slightly intensified as it tracked northwestward across the following day.

At 09:00 UTC on July 23, Doksuri began to rapidly intensify as it reached typhoon status over the Philippine Sea. Its rapid intensification is attributed to a lack of vertical wind shear affecting the cyclone whilst moving over very warm (29–30 °C, 84–86 °F) ocean waters. Satellite imagery showed the development of an eye-like feature, which was fully defined by 03:00 UTC on July 24. Over 24 hours, its maximum sustained wind speeds grew by 30 knots (56 km/h; 35 mph) and eventually reached a peak of 100 knots (190 km/h; 120 mph). At 21:00 UTC, the JTWC upgraded the system into a 'super typhoon'—its highest storm category—after Doksuri attained 1-minute sustained winds of 130 knots (240 km/h; 150 mph).

At 08:00 PHT (00:00 UTC) on July 25, PAGASA declared Doksuri a 'super typhoon', making it the second PAGASA super typhoon of the season; the JTWC later downgraded the system from its super typhoon category by 09:00 UTC. Doksuri significantly slowed down as it approached the extreme northern Philippines, with a slight wobble in its movement. Though atmospheric conditions made further development favorable, interaction with land and some dry air around the system suppressed development. Nevertheless, it held its peak intensity of 100 knots for over 12 hours. At around 12:00 UTC, the storm was now just off the coast northwest of Cagayan, continuing its west-northwestward track. With its eye almost complete surrounded by dry air, Doksuri began to undergo an eyewall replacement cycle at 15:00 UTC. PAGASA downgraded the storm into a typhoon prior to making landfall at Fuga Island in Aparri, Cagayan, around 03:10 PHT (19:10 UTC). It completed its eyewall replacement cycle around 21:00 UTC, though it still maintained its intensity. Now moving westwards through the Luzon Strait, Doksuri made a second landfall over Dalupiri Island at 11:00 PHT (03:00 UTC) on July 26. The storm significantly slowed down following landfall, remaining quasi-stationary over the Babuyan Islands.

Prolonged interaction with the rugged terrain of northern Luzon began weakening the system, which slowly began moving westwards by 09:00 UTC. Doksuri left the Philippine Area of Responsibility at around 10:00 PHT (02:00 UTC) on July 27. Doksuri underwent another round of rapid intensification in the South China Sea southwest of Taiwan, forming a pinhole eye as it did so, the JTWC assessed the storm to have strengthened into 195 km/h (120 mph) of winds. Doksuri moved northwestward and subsequently made its third landfall in Jinjiang, Fujian, with two-minute sustained winds of 180 km/h (50 m/s) on July 28. As it moved further inland, Doksuri rapidly weakened. Shortly after the landfall, the JTWC discontinued warnings on the system. Doksuri tracked northwards until it was last noted on July 29, marking its dissipation.

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