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Typhoon Nina (Bebeng)

Typhoon Nina on August 2
Meteorological history
Formed	July 30, 1975
Remnant low	August 6, 1975
Dissipated	August 8, 1975
Violent typhoon
10-minute sustained (JMA)
Highest winds	250 km/h (155 mph)
Lowest pressure	900 hPa (mbar); 26.58 inHg
Category 4-equivalent super typhoon
1-minute sustained (SSHWS/JTWC)
Highest winds	250 km/h (155 mph)
Lowest pressure	916 hPa (mbar); 27.05 inHg
Overall effects
Fatalities	over 26,000 directly and 100,000 indirectly
Damage	$1.2 billion (1975 USD)
Areas affected	Taiwan, Eastern and Central China
IBTrACS
Part of the 1975 Pacific typhoon season

Typhoon Nina, known in the Philippines as Typhoon Bebeng, was a deadly tropical cyclone in the summer of 1975. It formed on July 30 and gradually intensified as it moved generally to the west. On August 2, Nina reached peak intensity, and a day later the typhoon struck Taiwan. It weakened before moving ashore southeastern China. While moving slowly through central China, it dropped heavy rainfall and caused several dam failures, including the Banqiao Dam. It is one of the deadliest typhoons in the Pacific. Flooding from the Banqiao Dam collapse killed 26,000 people, with 100,000 more dying from subsequent famine and diseases.

Meteorological history

A well defined trough line extending southeastward into the Philippine Sea spawned a disturbance on July 29. After its initial status as a disturbance, Tropical Depression 04W was designated and moved southwestward for 36 hours as the structure of the system began to organize. On July 31, the depression slowed and began to rapidly intensify, becoming a tropical storm and was named "Nina". It began to turn to the northwest afterward. A subtropical ridge prevented Nina from turning further north and it began to track west-northwest just before reaching typhoon intensity.

Nina underwent explosive development in the late hours of August 1. Aircraft reconnaissance reported a 65 hPa drop of pressure, with winds increasing from a mere 65 to 130 knots (75 to 150 mph; 120 to 241 km/h) the day after. During that period, it attained its peak intensity of 135 knots (155 mph; 250 km/h). The typhoon began to weaken as it approached Taiwan, making landfall near the coastal city of Hualien as a Category 3 storm with 100 kn (120 mph; 190 km/h) winds.

The storm began to weaken as it went across the island's central mountain range, sparing the most populated areas from the eyewall. It entered the Formosa Straits as a weak typhoon, making another landfall near Jinjiang, Fujian. After moving northwest and crossing Jiangxi, it turned north on the night of August 5 near Changde, Hunan. A day later, the storm moved over Xinyang, Henan, and was later blocked by a cold front near Zhumadian, Henan for three days. The stationary thunderstorm system brought heavy rainfall, causing the infamous collapse of the Banqiao Dam. The storm moved southwest on August 8, and dissipated soon afterwards.

Impact

Taiwan

Upon making landfall in Taiwan, the storm brought winds of 185 km/h (115 mph) to places near the storm's eye. Wind gusts were also measured up to 222 km/h (138 mph). Widespread heavy rainfall, peaking around 700 mm (28 in), from the storm triggered deadly flooding and landslides which killed 29 people and injured 168 others. Reports from the island indicate that 3,000 homes were damaged or destroyed by the typhoon. In the city of Hualien alone, four people were killed, 561 homes were destroyed, and 1,831 more homes were damaged. Across the island, domestic flights, trains, and bus services were all suspended due to the storm; however, Taipei Songshan Airport remained open for international flights.

China

Due to the interaction with the mountains of Taiwan, Nina weakened to a tropical storm before making landfall in China. The storm crossed the coastline with winds of 110 km/h (70 mph); however, little damage resulted near where the system struck land. Further inland, the remnants of the storm produced widespread torrential rainfall, with more than 400 mm (16 in) falling across an area of 19,410 km (7,490 sq mi). The heaviest rainfall was recorded along the Banqiao Dam where 1,631 mm (64.2 in) of rain fell, 830 mm (33 in) of which fell in a six-hour span. These rains led to the collapse of the Banqiao Dam, which received 1-in-2000-year flood conditions. In all, 62 dams failed during the disaster, causing large temporary lakes and US$1.2 billion (equivalent to $5.3 billion in 2023) in damage. The floods killed 26,000 people, while another 100,000 people died from subsequent famine and disease. Some online sources suggest a higher total death toll of 230,000.

See also

• Banqiao Dam
• 1970 Bhola cyclone – the deadliest tropical cyclone recorded worldwide.
• Cyclone Nargis (2008) – the deadliest named tropical cyclone worldwide in terms of direct fatalities.
• Storm Daniel (2023) – a medicane which also caused catastrophic dam failures that led to thousands of deaths in Libya.

References

1. "Archived copy" (PDF). Archived from the original (PDF) on 2010-02-02. Retrieved 2009-11-17.{{cite web}}: CS1 maint: archived copy as title (link) JTWC's ATCR on the 1975 typhoon season
2. http://www.hnqx.cn/xqhy/xq_view.jsp?id=6814 Pan Jiazheng, the progress of the 1975 flood Archived March 13, 2007, at the Wayback Machine
3. Monsoons Over China by Ding Yihui, Springer 1994 edition (December 31, 1993), page 229.
4. "河南省气象局 纪念"75·8"学术研讨会专题". Archived from the original on 2007-03-13. Retrieved 2006-06-01.
5. NOAA
6. MDR
7. Climatological Center, Meteorological Development Bureau (2011). Tropical cyclones in Thailand: Historical data 1951–2010 (PDF) (Report). Thai Meteorological Department. Archived from the original (PDF) on March 3, 2016. Retrieved 5 October 2020.
8. https://www.academia.edu/14280191/CYCLONE_HAZARD_IN_BANGLADESH
9. ^ Joint Typhoon Warning Center (1976). "Super Typhoon Nina (04W) Preliminary Report" (PDF). Naval Meteorology and Oceanography Command. Archived from the original (PDF) on June 7, 2011. Retrieved July 19, 2010.
10. Staff Writer (August 4, 1975). "Typhoon batters Taiwan". The Montreal Gazette. p. 2. Retrieved July 19, 2010.
11. 台灣全區總雨量 (in Chinese). Chinese Weather Bureau. 1975. Retrieved July 19, 2010.
12. "Typhoon Kills 12 In Taiwan". The Modesto Bee. Associated Press. August 4, 1975. p. 83. Retrieved July 19, 2010.
13. United Press International (August 4, 1975). "Typhoon Nina Batters Taiwan With Rain, Wind". Sarasota Herald-Tribune. p. 5. Retrieved July 19, 2010.
14. 758大暴雨 (in Chinese). 华东师范大学. 2010. Archived from the original on July 7, 2011. Retrieved July 19, 2010.
15. Anderson-Berry 5-1 paper
16. "World Meteorological Organization's World Weather & Climate Extremes Archive".

External links

• Nina 1975 best track data
• Joint Typhoon Warning Center
• FIFTH INTERNATIONAL WORKSHOP ON TROPICAL CYCLONES TOPIC 2.1 Observing and forecasting rainfall
• 27th Conference on Hurricanes and Tropical Meteorology

• 1975 Pacific typhoon season
• Typhoons in Taiwan
• Typhoons in China
• 1975 in China
• July 1975 events in Asia
• August 1975 events in Asia