The 1988 Pacific typhoon season had no official bounds; it ran year-round in 1988, but most tropical cyclones tend to form in the northwestern Pacific Ocean between May and November. These dates conventionally delimit the period of each year when most tropical cyclones form in the northwestern Pacific Ocean. Tropical Storms formed in the entire west Pacific basin were assigned a name by the Joint Typhoon Warning Center. Tropical depressions that enter or form in the Philippine area of responsibility are assigned a name by the Philippine Atmospheric, Geophysical and Astronomical Services Administration or PAGASA. This can often result in the same storm having two names. A total of 26 tropical cyclones formed this year in the Western Pacific, of which all became tropical storms. Of the 26, 10 storms reached typhoon intensity, of which 1 reached supertyphoon strength. Nine tropical cyclones moved through the Philippines this season, making this season the most active for the archipelago so far this decade. Seasonal summary A total of 26 tropical cyclones formed this year in the Western Pacific, of which all became tropical storms. Of the 26, 10 storms reached typhoon intensity, of which 1 reached supertyphoon strength. Nine tropical cyclones moved through the Philippines this season. Systems Typhoon Roy (Asiang) Typhoon Roy, which crossed the open Western Pacific as a Category 4 typhoon in January, caused moderate to extensive damage across the Federated States of Micronesia and the Philippines, causing $23.5 million (1988 USD) but only one death. Typhoon Susan (Biring) Typhoon Susan formed at the end of May just to the north of Luzon Island in the Philippines. As a depression Susan dropped heavy rains in and around the Manila area the resulting landslides killed 6 people. As Susan moved away from the Philippines the storm strengthened into a typhoon shortly before cross in the southern tip of Taiwan and turning extratropical just after passing Okinawa. Tropical Storm 03W (Konsing) 3W was a short lived tropical storm. Typhoon Thad (Ditang) A tropical depression was designated by the JMA early on June 18. At the time, the depression was located south of the Caroline Islands. Further development was slow to occur due to strong winds aloft caused by a TUTT. Nevertheless, the system's cloud structure and outflow pattern slowly improved, and based on Dvorak estimates of T2.5/, the JTWC upgraded the disturbance into Tropical Storm Thad at 00:00 UTC on June