Surigae (Bising) A low-pressure area south of Woleai developed into a tropical depression on April 12. A few hours later, the JTWC issued a TCFA for the developing storm, with the PAGASA beginning to issue advisories for the tropical depression as it remained outside of the PAR. On April 13, the JTWC upgraded the system to a tropical depression and assigned it the designation 02W. At 18:00 UTC, the JMA upgraded the cyclone to a tropical storm and named it Surigae. On April 15 at 00:00 UTC, the JMA upgraded Surigae to a severe tropical storm as an eye began forming. Later that day, the JTWC upgraded the storm to a typhoon, making it the first of the season. Surigae then entered the PAGASA's Philippine Area of Responsibility, getting the local name Bising. The JMA followed suit early on the next day as a central dense overcast developed and filled the original eye. Surigae continued to rapidly intensify, and on April 16, the JTWC upgraded Surigae to a Category 2-equivalent typhoon on the SSHWS. The system continued its rapid intensification until it reached Category 5-equivalent super typhoon status, becoming the most intense typhoon ever recorded in the month of April. Surigae soon reached its peak intensity, with a minimum central pressure of , 10-minute maximum sustained winds of 220 km/h (140 mph), and 1-minute sustained winds of 315 km/h (195 mph). After attaining peak intensity, signs of a concentric eyewall indicated that the storm was undergoing an eyewall replacement cycle, with the central dense overcast starting to warm and the eye becoming cloud-filled. On April 19, following its eyewall replacement cycle, Surigae became annular. A few days later, on April 22, Surigae began to weaken again, with the storm's structure deteriorating and its large eye dissipating. Soon afterward, all of the remaining convection was sheared to the east as the storm moved over cooler waters. As most of the remaining thunderstorms had dissipated, the JTWC assessed that Surigae transitioned into a subtropical cyclone on April 23. Late on April 24, the JTWC issued their final advisory on the system as it was nearing the completion of its extratropical transition. A few hours later, the JMA declared that Surigae had become extratropical. After being named, tropical storm watches and warnings were issued for Yap in the Federated States of Micronesia, as well as for Koror and Kayangel in Palau on April