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Typhoon Ida
Meteorological history
Formed	September 10, 1945
Dissipated	September 20, 1945
Category 1-equivalent typhoon
	1-minute sustained (SSHWS)
Highest winds	130 km/h (80 mph)
Lowest pressure	917 hPa (mbar); 27.08 inHg
Overall effects
Fatalities	2,473
Missing	1,283
Areas affected	Japan, China, Russia Far East, Kuril Islands, Guam
	IBTrACS
	Part of the 1945 Pacific typhoon season

Typhoon Ida, known in Japan as Makurazaki Typhoon (枕崎台風),^[1]^[2] was a powerful and very deadly typhoon which formed over the western Pacific Ocean and struck Japan in September 1945, shortly after the Japanese surrender in World War II, causing over 2,000 deaths. The storm struck parts of Kyushu and Ryukyu which had already been ravaged by the war and compounded the effects of the atomic bombing of Hiroshima, which had occurred only one month prior, resulting in further devastation to the already destroyed city. The typhoon likely had much higher wind speeds than were recorded at the time, with current estimates of the storm's minimum pressure as low as 917 millibars, though meteorologists are uncertain of the storm's true intensity. The typhoon remains one of the deadliest in Japanese history and is one of only a few storms to be known by a separate name in Japanese.

Meteorological history

A tropical depression formed in the West Pacific on September 10 and intensified before being designated as Typhoon Ida. Ida continued to slowly move westwards, and after beginning to curve north rapidly intensified into a powerful typhoon. The storm made landfall near Makurazaki in Kagoshima Prefecture on the Japanese mainland on September 17.^[1] Ida was at the time 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.^[3] This reading makes the storm responsible for the second-lowest atmospheric pressure ever recorded in mainland Japan, after the 1934 Muroto typhoon.^[2]^[1]^[4] After passing over Japan, Ida turned northeast and weakened, eventually becoming extratropical and dissipating near the western Aleutian Islands on September 20.

Impact and aftermath

**Significant typhoons with special names**^[5]
(from the Japan Meteorological Agency)
Name	Number	Japanese name
Ida	T4518	Makurazaki Typhoon (枕崎台風)^[6]^[2]
Louise	T4523	Akune Typhoon (阿久根台風)
Marie	T5415	Tōya Maru Typhoon (洞爺丸台風)
Ida	T5822	Kanogawa Typhoon (狩野川台風)
Sarah	T5914	Miyakojima Typhoon (宮古島台風)
Vera	T5915	Isewan Typhoon (伊勢湾台風)
Nancy	T6118	2nd Muroto Typhoon (第2室戸台風)
Cora	T6618	2nd Miyakojima Typhoon (第2宮古島台風)
Della	T6816	3rd Miyakojima Typhoon (第3宮古島台風)
Babe	T7709	Okinoerabu Typhoon (沖永良部台風)
Faxai	T1915	Reiwa 1 Bōsō Peninsula Typhoon (令和元年房総半島台風)
Hagibis	T1919	Reiwa 1 East Japan Typhoon (令和元年東日本台風)

More than 2,000 people were killed in the Hiroshima Prefecture after heavy rains brought by a weakening Ida caused severe landslides.^[7]^[1]^[8] The storm occurred just days after the Empire of Japan surrendered to the Allies in the Pacific War, formally ending World War II, and the damage caused by Ida worsened the situation in the already war-ravaged country.^[1]^[8]

In addition, the storm affected many ships of the United States Navy's Pacific Fleet. USS Repose (AH-16) reportedly entered Ida's eye and observed an atmospheric pressure of 25.55 inches of mercury (about 865 hPa).^[9]^[10]^[11] This is below the official world record for minimum sea-level pressure (870 hPa) recorded during Typhoon Tip in 1979, although Repose's data is not confirmed.

References

^ ^a ^b ^c ^d ^e "枕崎台風昭和20年（1945年）９月17日～９月18日". www.data.jma.go.jp (in Japanese). Retrieved 2020-08-08.
^ ^a ^b ^c 第三版,日本大百科全書(ニッポニカ), ブリタニカ国際大百科事典小項目事典,朝日新聞掲載「キーワード」,デジタル大辞泉,百科事典マイペディア,世界大百科事典第２版,大辞林. "枕崎台風(まくらざきたいふう)とは". コトバンク (in Japanese). Retrieved 2020-08-08.{{cite web}}: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link) Cite error: The named reference ":2" was defined multiple times with different content (see the help page).
^ Weather Records of Makurazaki Japan Meteorological Agency
^ "バイオウェザー・お天気豆知識". www.bioweather.net. Archived from the original on 2021-02-24. Retrieved 2020-08-08.
^ "気象庁が名称を定めた気象・地震・火山現象一覧" (in Japanese). Japan Meteorological Agency. Retrieved 20 February 2020.
^ "枕崎台風昭和20年（1945年）９月17日～９月18日". www.data.jma.go.jp (in Japanese). Retrieved 2020-08-08.
^ Makurazaki typhoon Hiroshima disaster prevention Web Archived 2017-07-14 at the Wayback Machine Hiroshima Prefectural Government
^ ^a ^b "ＰｅａｃｅＳｅｅｄｓヒロシマの１０代がまく種（第１６号）終戦直後を襲った「枕崎台風」". ヒロシマ平和メディアセンター (in Japanese). Retrieved 2020-08-08.
^ 講談社『ギネスブック世界記録事典 1980』90頁の他、1981年度版、1982年度版等にも記載があるが、865hPaではなく856hPaとなっている。
^ "Repose newspaper page 1". 2001-09-09. Archived from the original on 2001-09-09. Retrieved 2020-08-08.
^ Davis, Chuck (1998-12-05). "Hospital Ship USS REPOSE (AH-16)". Archived from the original on 1998-12-05. Retrieved 2020-08-08.