On September 14 a tropical disturbance formed to the northeast of Guam. Over the next few days it slowly developed, with the JMA designating it as a minor tropical depression on September 17. Later that day the Joint Typhoon Warning Center (JTWC) then issued a Tropical Cyclone Formation Alert on the developing tropical depression. Late the next day the JTWC designated the depression as 18W as it began to issue advisories on the depression. Early on September 19 the JMA began to issue full advisories on the depression as it moved in to PAGASAs Area of Responsibility and was named Nina by PAGASA. Later that day both the JMA & the JTWC upgraded the depression to a tropical storm. The JMA named the storm as Hagupit, and assigned the international number of 0814. Early the next day Hagupit intensified into a severe tropical storm, and a category 3 typhoon later that day. It reached maximum intensity with 140 mph winds on September 23, and made landfall at that strength the next day. It then dissipated over land, thus late on September 24 JTWC issued its final advisory on the system followed by JMA early the next day.
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