Owing to favorable environmental conditions, the typhoon intensified and reached its peak with ten-minute maximum sustained winds of 165 km/h (105 mph), and a central atmospheric pressure of 935 hPa (27.61 inHg).

Gaemi made landfall in China as a minimal tropical storm in the Xiuyu District of Putian in Fujian Province.

Together with the southwest monsoon and Tropical Storm Prapiroon, heavy rains were reported over southern and northern Luzon, triggering widespread flash floods in various areas of the region.

The oil tanker MT Terra Nova, carrying around 1.5 million liters of industrial fuel, capsized and sank in 34 m (112 ft) depth of water in Manila Bay off the coast of Limay, Bataan.

The origins of Typhoon Gaemi can be traced back to July 17, when the Japan Meteorological Agency (JMA) reported that a low-pressure area had formed east of Palau.

[1] Environment was generally favourable for tropical cyclogenesis, with warm sea surface temperatures of 27–28 °C (81–82 °F), low vertical wind shear and excellent poleward and equatorward outflow.

[4][5] The Philippine Atmospheric, Geophysical and Astronomical Services Administration followed suit a few hours later, upgrading the system from a low-pressure area to a depression and assigning it the name Carina.

[7] Gaemi's deep convection later began to consolidate into a small central dense overcast, with cloud tops reaching temperatures of −90 °C (−130 °F).

[10] Around 00:00 UTC on July 22, the JMA then reported that Gaemi had intensified into a typhoon due to good upper-level outflow, warm sea surface temperatures, and high ocean heat content.

[12] As it remained quasi-stationary six hours later, due to a weak steering environment between the subtropical ridge to the northwest and east, the JTWC upgraded Gaemi to minimal typhoon-equivalent status around 21:00 UTC that day.

[13] After undergoing an eyewall replacement cycle and developing a pinhole eye, Gaemi rapidly intensified and peaked at Category 4-equivalent intensity on the Saffir-Simpson scale at 21:00 UTC on July 23, with 1-minute sustained winds of 230 km/h (145 mph).

[14] The JMA reported that Gaemi reached its peak intensity at 06:00 UTC on July 24, with 10-minute sustained winds of 165 km/h (105 mph) and a central pressure of 935 hPa (27.61 inHg).

[15][16] A study by World Weather Attribution in August 2024 suggests that Gaemi's extreme winds and heavy precipitation were exacerbated by climate change.

[15][24] As Gaemi developed in the Philippine Area of Responsibility, the PAGASA began issuing weather advisories on the system, as it interacted with the southwest Tropical Storm Prapiroon over the South China Sea.

[25] Initial forecasts issued by the agency projected that Gaemi would not make landfall on the Philippines, however, moisture from the southwest monsoon would be drawn into the storm and bring heavy rainfall and strong winds to the archipelago.

[28] Classes in all levels and several local government units were suspended in some areas of Luzon including Metro Manila on July 23 due to the storm.

[31] The Provincial Disaster Risk Reduction and Management Office (PDRRMO) in La Union raised a red alert on July 21, requiring all personnel to be readied for deployment.

Rapid response teams trained for recovery efforts and damage assessments were also readied in Clark, Davao City, Laoag, Mactan, and the Zamboanga Peninsula.

Heavy rainfall occurred in Albay, Aklan, Antique, Bataan, Batangas, Cavite, Capiz, Oriental Mindoro, Rizal, and Zambales.

[63] Several sections of the North Luzon Expressway were rendered impassable due to the torrential rain brought by the two weather conditions.

[66] Severe weather conditions forced vessels to remain in ports, stranding 70 people in Southern Tagalog and Bicol Region, combined.

[67][68] A state of calamity was declared in Metro Manila and in the provinces of Bataan, Batangas, Bulacan, Cavite, Ilocos Norte, Oriental Mindoro and Pampanga[69][70][71] due to the widespread floods that occurred in various areas of the region.

[72] The monsoon enhanced by Gaemi's impact on Luzon led to comparisons to 2009's Typhoon Ketsana, which was known locally as Tropical Storm Ondoy.

[77] As of August 26, 2024[update], the National Disaster Risk Reduction and Management Council reported that 6,498,918 people were affected by Gaemi, along with the impacts of the southwest monsoon and nearby Tropical Storm Prapiroon (Butchoy), resulting in 1,141,926 individuals displaced from their homes, 108 cities experiencing power outages, and 9,790 houses damaged.

[52] Gaemi made landfall in China as a tropical storm with maximum sustained winds of around 120 km/h (75 mph) in the Xiuyu District of Putian in Fujian Province.

[98] In the city of Sinuiju and the neighboring Uiju County, about 4,100 houses, 3,000 hectares (7,410 acres) of agricultural fields and numerous public buildings, roads and railways were flooded.

[100] North Korean state media reported that Supreme Leader Kim Jong Un traveled to flooding sites to survey damages.

[56][dubious – discuss] A government meeting agreed on constructing 4,400 new houses in Sinuiju and Uiju, while also reinforcing embankments and restoring damaged infrastructure in Jagang province.

[101] Russian President Vladimir Putin expressed condolences to North Korea for damage caused by the flooding, and offered to provide humanitarian support.