Typhoon Mujigae, known in the Philippines as Tropical Storm Kabayan, was the costliest typhoon to impact China in 2015. The typhoon caused widespread damage in the Chinese provinces of Guangdong, Guangxi, and Hainan from October 3 to 6, 2015; earlier in its existence it impacted the Philippines as a developing tropical cyclone, and later on it brought heavy rain to Thailand and Vietnam. Mujigae originated from an area of disturbed weather that formed just east of the Philippines on September 29. The disturbance slowly organized amid a favorable environment, becoming a tropical depression on September 30. It traveled steadily west-northwestwards and made landfall in Central Luzon late on October 1, before crossing into the South China Sea the next morning. Mujigae strengthened quickly and t