km/h (115 mph) on September 23. Around the time of reaching peak intensity, Mireille turned more to the northwest along the southwestern periphery of the subtropical ridge. The increasing size began to impart wind shear in Typhoon Nat to the west, and the two storms underwent the Fujiwhara effect, in which Nat turned sharply southward while Mireille progressed toward the Ryukyu Islands of Japan. After maintaining peak winds for about 30 hours, Mireille began weakening, passing just east of Miyako-jima on September 26 with 10‑minute winds of 165 km/h (105 mph), according to the JMA. That day, the typhoon accelerated to the northeast due to increasing mid-level winds from the southwest, passing west of Okinawa. According to the JMA, Mireille re-intensified slightly on September 27 to a secondary peak of 175 km/h (110 mph), aided by unusually warm water temperatures in the East China Sea. The typhoon made landfall at that strength at 07:00 UTC between Saikai and Nagasaki along southwest Kyushu. The pressure at landfall was , the lowest in the country since Typhoon Trix in 1971. The typhoon quickly weakened while continuing northeastward through Kyushu and western Honshu, and started to become an extratropical cyclone; during the process, the wind field expanded, aided by moist air from the southwest and cold air from the northwest. It accelerated further over the Sea of Japan, and late on September 27, Mireille made a second landfall in Japan along southwestern Hokkaido at 22:00 UTC, with 10‑minute winds of 150 km/h (90 mph) still at typhoon status. Crossing the island, the typhoon weakened to tropical storm status early on September 28, and shortly thereafter became fully extratropical in the Sea of Okhotsk. The powerful remnants of Mireille continued eastward, crossing the Aleutian Islands on September 29 and crossed the International Date Line shortly thereafter. That day, a pressure of 954 mb (hPa; 28.17 inHg) was observed in the Pribilof Islands of Alaska. Powerful winds battered vessels in the region, with the Merchant Pride reporting peak sustained winds of 110 km/h (70 mph). After crossing the dateline, Mireille's remnants turned northeast and struck the Seward Peninsula on October 3 before moving over Arctic Alaska. The system then moved over the Arctic Ocean where it was last noted on October 4. Preparations and impact Early tropical cyclone computer models anticipated Mireille would pass close to Guam, prompting officials to undergo preparations for the storm.