Tropical Storm Kujira (2015)

Tropical Storm Kujira was a tropical cyclone that prompted the PAGASA to declare the beginning of the rainy season in the Philippines. The ninth tropical depression, 8th named storm, and first storm to make landfall on China in the 2015 Pacific typhoon season, it formed as a tropical depression south of the Paracel Islands on June 19.

Kujira caused 9 deaths in Vietnam due to flash flooding.

Meteorological history
On June 15 at 20:00 UTC, the Joint Typhoon Warning Center (JTWC) began monitoring an area of convection that was located approximately 385 nmi east-southeast of Huế, with the JTWC assessing the tropical cyclone development potential within the next day as low. The disorganized system was located within favorable conditions for development, with sea surface temperatures in the area ranging from 30-31 C. The system began to organize, and on the next day at 06:00 UTC, the JTWC upgraded its development potential within the next day to medium. At 18:00 UTC, the Japan Meteorological Agency (JMA) began issuing warnings on a tropical depression that had formed to the south of the Paracel Islands.

On June 20 at 03:00 UTC, the JTWC issued a Tropical Cyclone Formation Alert on the system. Convection continued to deepen over the low-level circulation, and at 15:00 UTC, the JTWC upgraded the system to a tropical depression as it was located approximately 178 nmi east-southeast of Da Nang, giving it the unofficial designation 08W. On June 21 at 00:00 UTC, the JMA upgraded the depression to a tropical storm, assigning it the name Kujira. The convection became sheared to the southwest of the low-level circulation, and on June 22 at 03:00 UTC, the JTWC upgraded Kujira to a tropical storm. At 12:00 UTC, Kujira peaked in intensity, with maximum sustained winds of 50 mph (85 km/h) and a minimum central pressure of 985 hPa (mbar; 29.09 inHg) as it made landfall on Hainan. The JTWC briefly downgraded Kujira to a tropical depression as it entered the Gulf of Tonkin on June 23 at 03:00 UTC. Kujira briefly re-intensified before making its final landfall on north Vietnam on June 24 at 03:40 UTC; the JTWC issued its final warning on Kujira at 03:00 UTC. The JMA issued its final warning on Kujira at 18:00 UTC, dissipating 12 hours later.

Vietnam
22 thousand ships were notified of the presence of Kujira on June 21. 31 thousand personnel and over 1 thousand vehicles were mobilized to assist in emergencies. Flash floods killed 14 people, eight of which occurred in Sơn La Province, where rainfall of 280 mm was recorded. 15 people were injured and 382 houses were submerged, with another seventy being destroyed. 600 hectares of crops were inundated, and 12 bridges and several vehicles were swept away. Landslides throughout the areas affected cut off several sections of highways and roads. In Cua Ong, a peak gust of 26 m/s was recorded, and on Bạch Long Vĩ Island, a station recorded a minimum pressure of 984.2 hPa (mbar; 29.06 inHg). 219.9 mm of rain was recorded from June 24–25, with other areas near the coast experiencing heavy rains. Total losses caused by Kujira were about ₫385 billion (US$17.6 million) throughout the country.

China
Rainfall from Kujira eased the worst drought in Hainan since 1959. 40 thousand people were evacuated, and 162 flights were cancelled in Haikou Meilan International Airport and in Sanya Phoenix International Airport, which affected 11 thousand passengers. Heavy rainfall and gale-force winds affected Hainan, with high-speed trains between Haikou and Sanya being suspended. 40 thousand people were displaced and 20 thousand fishing boats returned to harbors, and elementary and middle schools in Haikou were suspended. Hainan and Guangxi received between 250-392 mm of rainfall. In Dongfang, Hainan, rainfall of 312 mm was reported. 159 thousand people were affected, and ¥85 million (US$13.69 million) in economic losses was incurred.

Hong Kong
On June 21 at 13:40 UTC, a Signal No. 1 warning was issued for Hong Kong, before being cancelled on the next day at 23:40 UTC. A gust of 67 kph was recorded on Waglan Island. HK$1,570 (US$202) in damages were recorded in Hong Kong.

Elsewhere
Kujira enhanced the southwest monsoon in the Philippines, prompting the PAGASA to declare the beginning of the rainy season. Fishermen were warned of gale conditions in the Andaman Sea and in the Gulf of Thailand. Northeast Thailand experienced precipitation. Rainfall associated with Kujira brought flooding to parts of Myanmar.