The 1945 Pacific typhoon season was the first official season to be included in the West Pacific typhoon database. It has no official bounds; it ran year-round in 1945, but most tropical cyclones tend to form in the northwestern Pacific Ocean between June and December. These dates conventionally delimit the period of each year when most tropical cyclones form in the northwestern Pacific Ocean.
A small, yet powerful typhoon, Connie, was first spotted on June 1 by the Weather Central Guam, moving northeast. Winds were reported to have been as high as 140 mph. But by June 7, it began to weaken. Its final fate is unknown. The U.S. Navy's Third Fleet was hit by Connie. The same fleet had previously been hit, with great loss of life, by Typhoon Cobra, in 1944. Connie being lesser, only one officer and five USN men were lost or killed because of Connie, and around 150 airplanes on its carriers were either lost or damaged.
Typhoon Helen formed on August 29. It moved west-northwest and strengthened into a category 3 typhoon with 120 mph winds. It weakened slightly to a category two and struck Taiwan. It briefly was over waters before it hit Mainland China as a tropical storm. It dissipated on September 4.
This typhoon is especially remembered for the 6 aircraft containing liberated prisoners of war brought down by the typhoon between Okinawa and Manila. Over 120 servicemen lost their lives. At the time, it was the single greatest loss of life in an aviation disaster during peacetime.
Winds not specified 916.1 (lowest observed over land) hPa (mbar)
In Japan, Typhoon Ida is called Makurazaki Typhoon. It was the strongest typhoon to hit Kyushu on record, with a minimum sea-level pressure of 916.1 hPa (27.05 inHg) and a maximum wind gust of 62.7 metres per second (140 mph), which was recorded at a weather station in Makurazaki. More than 2,000 people were killed in the Hiroshima Prefecture after heavy rains brought by a weakening Ida caused severe landslides.
Louise was first seen developing on October 2, 1945, in the Caroline Islands. It unexpectedly veered north and slowed down, only to intensify as it passed over Okinawa on October 9 with 90 mph wind gusts and a minimum central pressure of 968.5 mbar. Shortly after, Louise began to weaken, and hit Japan as a strong tropical storm. The tropical cyclone became extratropical shortly after on October 12. In Okinawa, 36 people died, 47 people were reported missing, and 100 people were seriously injured.
In Buckner Bay, where the US military were occupying a temporary base, 30 ft (9.1 m) to 35 ft (11 m) waves were reported to have crashed ashore, tearing into Quonset huts and other buildings. At the time, Buckner Bay was being used as a port by the US military. Fifteen merchant ships were driven ashore, with a few wrecked. Three US Navy destroyers were grounded and declared beyond salvage. Over 200 other US military vessels, including six LSTs, a number of special purpose boats, patrol boats, and amphibious landing craft were grounded, severely damaged, or wrecked beyond repair. Eighty percent of the buildings in the bay were completely wiped out, while all 60 airplanes at the local airports were damaged.