according to the JTWC. Muifa was downgraded to a tropical depression again by the JTWC on its last bulletin for the system. On September 13, China issued an orange alert (Signal #2) on Muifa, warning that it could impact the Taiwan Strait, in addition to the provinces of Jiangsu, northern Zhejiang, and Shanghai. Several flights departing from the airports in Zhoushan, Ningbo and Shanghai were suspended due to Muifa. Activities in the Port of Shanghai were also suspended. Typhoon Merbok On 00:00 UTC of September 9, the JMA began tracking a weak tropical depression that had developed west of Wake Island. The JMA downgraded the system to a low-pressure area shortly thereafter. However, on the next day, the JMA re-upgraded the system to a tropical depression. The JTWC followed suit and began issuing advisories, assigning it the designation 15W. In its fifth bulletin, the JTWC stated that 15W turned into a tropical storm when it reached one-minute sustained winds. The JMA named the system Merbok on September 12, due to it having achieved 10-minute sustained winds of . Later that day, Merbok reached severe tropical storm status. The next day, the JTWC reported that Merbok became a Category 1 typhoon, reaching sustained winds of . On September 15, the JTWC gave its final bulletin on Merbok, noting that it had moved away from habitable areas. After transitioning into an extratropical cyclone, the system tracked generally northeastward and continued to deepen as it approached the western Aleutian Islands. It crossed the islands, entering the Bering Sea late on as it maintained hurricane-force winds and reached its minimum central barometric pressure of early the next day. The storm track generated a large dynamic fetch across the Bering Sea, which contributed to a dangerous storm surge that inundated several coastal villages and towns in western Alaska. Governor Mike Dunleavy declared a state of emergency in the region before the cyclone hit. Water levels in Unalakleet peaked at around , which was among its largest peaks on record. Significant flooding and gale force winds were also reported in Golovin, Nome, Shaktoolik and Kotlik. Despite the widespread coastal flooding, no injuries were reported. Typhoon Nanmadol (Josie) On 06:00 UTC of September 9, the JMA briefly tracked a weak tropical depression to the east of Iwo To, Japan. The JMA re-upgraded the system to a tropical depression two days later. On September 12, the JTWC designated