Typhoon Ione

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Map key
  Tropical depression (≤38 mph, ≤62 km/h)
  Tropical storm (39–73 mph, 63–118 km/h)
  Category 1 (74–95 mph, 119–153 km/h)
  Category 2 (96–110 mph, 154–177 km/h)
  Category 3 (111–129 mph, 178–208 km/h)
  Category 4 (130–156 mph, 209–251 km/h)
  Category 5 (≥157 mph, ≥252 km/h)
  Unknown
Storm type
Disc Plain black.svg Tropical cyclone
Solid black.svg Subtropical cyclone
ArrowUp.svg Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

At 00:00 UTC of September 11, the Fleet Weather Center noted that a tropical storm formed near the Mariana Islands, with one-minute sustained winds of 75 km/h (45 mph) detected near its center. [4] [5] The agency also named it Ione, the fourteenth storm to be named during the season. [4] It steadily organized as it passed the island country, before strengthening to a minimal typhoon during September 13. [4] Moving to the northwest, it started to rapidly intensify under a favorable environment, becoming a Category 4 typhoon at 12:00 UTC of September 14, nearly 1,023 km to the southeast of Miyakonojō. [4] [5] It held its intensity over 7 hours, before slowly weakening as it started to interact with an unfavorable environment. [4] [5] A strengthening high-pressure area curved Ione to the north-northeast, while further degrading to a Category 2 typhoon. [4] [5] Land interaction with the Japanese archipelago weakened the typhoon, before making landfall as a minimal typhoon between the cities of Tateyama and Kisarazu on the mid-morning of September 16. [4] [5] [6] While inland, Ione rapidly weakened to a tropical storm as it moved to the Pacific Ocean, with the system starting extratropical transition. [4] [5] [6] The system was last noted at 00:00 UTC of the next day as it fully became extratropical. [4] The remnants; however, continued to move to the northeast, passing through the Kuril Islands before dissipating on the Sea of Okhotsk. [6]

Preparations, impact and aftermath

In the preparations for the typhoon, railway and flight operations were halted due to the bad weather. [7] Some U.S. troops also helped to evacuate families through safe places. [7] Heavy rainfalls were also expected. [8]

Between 06:00 and 09:00 UTC (15:00 and 18:00 JST), Ione started to affect Japan. [6] In Tateyama, the maximum instantaneous wind speed recorded was 46.7 mph and the winds were strong in the center while the typhoon is making landfall, resulting in torrential rainfall and strong winds, causing many houses to fall and disintegrate. [9] Sendai recorded a rainfall amount of 351.1 mm and Miyako received an amount of 249.3 mm during the typhoon's passage. [6] Up to seven feet of floodwaters were experienced at Ichinoseki. [9] The typhoon also destroyed over 5,889 homes, leaving over 15,000 individuals homeless. [10] The authorities also received some considerable reports of crop and farmland damages in the prefectures of Gunma, Ibaraki and Yamanashi. [10] Some bridges in Ibaraki were also washed out by spilling rivers. [10] [11] Two hotels were also isolated due to a large landslide, trapping inside over a hundred Americans who were just staying in the place for the typhoon. [7] Some farmers, despite the storm, harvested their crops that were partially destroyed by the winds. [12] In addition, due to another extratropical storm in the Sea of Japan, the combined effects of the system and the typhoon caused heavy rainfall as far as Hokkaido. [6]

The records of the Japan Meteorological Agency about Ione shows 512 fatalities; however, some reports says it may be higher as 650 or 838. [13] Over 1,965 individuals were injured due to various reasons. [6] 435 ships also sustained damages and over 133,428 hectares of farmland were flooded and/or destroyed. [6]

Following the typhoon, in 1951, the Kitakami River basin in Kitakami River, located in Tohoku region was designated as a specified region under the National Comprehensive Land Development Act and a plan was started to protect the basin from the floods. [14]

See also

Typhoon disasters in Japan

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<span class="mw-page-title-main">Typhoon June (1954)</span> Pacific typhoon in 1954

Typhoon June was a large, strong and devastating typhoon that severely impacted the west and central areas of mainland Japan, causing scores of deaths and heavy devastation. A large storm, it was the tenth storm to be tracked by the Fleet Weather Center (FWC) during the 1954 Pacific typhoon season. The storm was already a tropical storm when it was first noticed by both the FWC and JMA by September 4. Only six hours later, the storm intensified into a typhoon and underwent rapid intensification into a modern-day Category 4 super typhoon just east of northern Luzon in the Philippines with maximum sustained winds of 130 knots calculated in 1-minute sustained winds along with JMA's estimates of its minimum pressure of 910 millibars (27 inHg) on September 7. However, it started to weaken below super typhoon status, and its intensity began to fluctuate while moving northwestwards and north-northwestwards. As it turned northwards by September 12, June regained its intensity as a Category 4 system before making landfall over Yamaguchi Prefecture's Shimonoseki City. There, it weakened and crossed into the Sea of Japan as a tropical storm. Data from the now-Joint Typhoon Warning Center indicated that as the storm made landfall somewhere Primorsky Krai, it retained its tropical storm status. Upon moving inland, it degenerated into an extratropical low before being last monitored by FWC during September 15. However, the JMA did the same on the next day at 06:00 UTC.

References

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  10. 1 2 3 "TYPHOON TAKES TOLL IN JAPAN". The Billings Gazette. 1948-09-17. p. 1. Retrieved 2021-04-02.
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  14. JCOLD, Japan Commission on Large Dams- (2018-02-06). Dams in Japan: Past, Present and Future. CRC Press. ISBN   978-1-134-00619-9.
Typhoon Ione
Typhoon Ione's Weather map on September 16, 1948.gif
This weather map on September 16 shows Ione nearing peak intensity while approaching Japan. Strengthening Jackie is also seen to its southwest.