An area of low pressure formed over the Caroline Islands on 15 June. It moved northwards initially and turned westwards two days later. This low pressure area then developed into a tropical depression on 21 June and was named Koryn while it was 710 km east-southeast of Yap. Early the next day, Koryn deepened further into a tropical storm and moved towards the west-northwest at 23 km/h. Two days later, rapid intensification took place and Koryn became a typhoon with a discernible eye. On the evening of 24 June, Koryn attained its peak intensity with maximum sustained winds of about 175 km/h and sea-level pressure of 935 hPa near the centre. It then moved steadily west-northwestwards at 23 km/h landing on northern Luzon early on 26 June.
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