Assertion: typhoon's eye | /r/CapableOf | prompt the jtwc
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text: The 35 km (25 miles) eye became sharper on October 17, prompting the JTWC upgrading Koppu to a super typhoon with one-minute maximum sustained winds at 240 km/h (150 mph) in the afternoon, equivalent to Category 4 of the Saffir–Simpson hurricane wind scale.