Typhoon Ruby, known in the Philippines as Typhoon Unsang, was the strongest typhoon to strike the Philippines in 18 years. The tenth typhoon of the 1988 Pacific typhoon season, Ruby formed from an area of low pressure situated east of the Philippines on October 20. The storm steadily intensified as it moved west, and then west-northwest. After developing an eye, Ruby attained typhoon intensity on October 23 and began to strengthen at a brisker clip. Ruby reached maximum intensity later that day, before moving ashore along the central portion of Luzon early on October 24. The storm steadily weakened over land and this trend only continued after Ruby entered the South China Sea. On October 27, Ruby made a second landfall as a tropical storm on Hainan Island before dissipating the next day.