It had also established an inner core of 75 to 90 km (45 to 55 mi) in diameter.[17] Two hours later, the JTWC also upgraded it to a Category 2 tropical cyclone, as it developed a small eye at about 7 nmi (13 km; 8.1 mi) in diameter.[18] However, by 18:00 UTC, it started to rapidly decline after its eye quickly collapsed and the cloud tops had warmed since.