Typhoon Surigae, known in the Philippines as Typhoon Bising, is a rapidly intensifying tropical cyclone east of the Philippines. The fourth tropical depression, second named storm, and first typhoon of the 2021 Pacific typhoon season, Surigae originated from a low-pressure area south of the Micronesian island of Woleai that organized into a tropical depression on April 12. At 18:00 UTC that day, it strengthened to a tropical storm and was named Surigae by the JMA. The formation of an eye and increasing winds prompted the JMA to upgrade it to a severe tropical storm on April 13. The storm proceeded to gradually strengthen, and late on April 15, Surigae strengthened into a typhoon.