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| Typhoon Nina (1975) | |
|---|---|
| Name | Typhoon Nina (1975) |
| Basin | WPac |
| Year | 1975 |
| Formed | 1975-07-29 |
| Dissipated | 1975-08-03 |
| 1-min winds | 135 |
| Pressure | 915 |
| Areas | Philippines, Taiwan, China |
Typhoon Nina (1975) Typhoon Nina (1975) was a powerful Pacific typhoon that struck the northern Philippines, Taiwan, and southeastern China in late July and early August 1975, causing catastrophic flooding and infrastructure failure. The storm's rapid intensification, catastrophic dam failure in Henan, and widespread agricultural and human losses made it a major event in East Asian meteorological and humanitarian history. Nina's passage influenced subsequent policy decisions in Republic of China (Taiwan), the People's Republic of China, and regional disaster management practices involving agencies such as the Joint Typhoon Warning Center, the Japan Meteorological Agency, and the Philippine Atmospheric, Geophysical and Astronomical Services Administration.
Nina originated as a tropical disturbance near the Marshall Islands in late July 1975, interacting with the Intertropical Convergence Zone, the Monsoon trough, and an upper-level trough associated with the Western Pacific monsoon. The system organized into a tropical depression south of the Mariana Islands and was later classified by the Joint Typhoon Warning Center and the Japan Meteorological Agency as a tropical storm. Rapid intensification occurred as Nina moved westward under favorable sea surface temperatures near the Philippine Sea and low vertical wind shear often associated with flow from the Subtropical ridge (northern hemisphere). Reconnaissance data from NOAA aircraft and synoptic observations from Hong Kong Observatory and Taiwan Central Weather Bureau noted a tightening eyewall and falling central pressure reaching near 915 hPa, with maximum sustained winds estimated by the JTWC comparable to a Category 4 Saffir–Simpson scale cyclone. The typhoon made landfall in northern Luzon before recurving toward Taiwan and later moving across the Taiwan Strait to strike Fujian and Zhejiang provinces in the People's Republic of China.
Warnings and preparations involved multiple agencies: advisories from the Joint Typhoon Warning Center, bulletins from the Japan Meteorological Agency, notices by the Hong Kong Observatory, and local alerts from the Philippine Atmospheric, Geophysical and Astronomical Services Administration and the Central Weather Administration (Taiwan). In the Philippines, the National Disaster Coordinating Council and regional authorities in Luzon coordinated evacuations and port closures. Taiwanese authorities in Taipei and Hualien ordered school suspensions and mobilized the Republic of China Armed Forces and civil defense units. In mainland China, provincial committees in Fujian and Zhejiang issued maritime warnings and instructed fisheries and riverine communities to seek shelter, while hydrological bureaus monitored reservoirs such as those governed by the Ministry of Water Resources (PRC).
Nina produced extreme wind, rain, and storm surge across multiple jurisdictions. In the Philippines, provinces in northern Luzon experienced high winds and coastal inundation affecting ports like Vigan and Laoag. In Taiwan, cities including Hualien, Kaohsiung, and Taipei reported landslides, damaged infrastructure, and agricultural losses in rice paddies near the Chianan Plain. The storm's most disastrous impact occurred in the People's Republic of China when torrential rains associated with Nina caused catastrophic flooding and the failure of multiple reservoirs and dams in Henan province, notably the collapse of the Banqiao Dam and numerous associated embankments. The dam failures unleashed surges that devastated downstream counties such as Zhengzhou-area localities and inundated towns along the Ru River. Casualties were enormous, with estimates of direct and indirect deaths and missing ranging widely; the crisis overwhelmed provincial authorities, rural communes, and healthcare facilities, prompting large-scale evacuations and humanitarian need. The flood severely impacted railways, highways including segments of the Longhai Railway, telecommunication lines, and destroyer-class naval facilities and fishing fleets, while crops and livestock losses across Henan, Anhui, and Jiangsu exacerbated food security concerns.
Post-storm response involved national and international actors: the Ministry of Public Health (PRC) coordinated medical relief, the People's Liberation Army assisted in search, rescue, and reconstruction, and provincial governments in Henan and neighboring provinces implemented emergency resettlement. In Taiwan, reconstruction was overseen by the Executive Yuan and the Coastal and Offshore Engineering Office, while the Philippines government mobilized repair of coastal infrastructure by the Department of Public Works and Highways. Relief operations included mobilization of the Red Cross Society of the People's Republic of China, the International Red Cross and Red Crescent Movement, and bilateral aid discussions with governments such as the United States and Japan. Long-term recovery involved rebuilding dams, revamping flood control projects under agencies like the Ministry of Water Resources (PRC), and revising reservoir safety protocols influenced by state research institutes including the Chinese Academy of Sciences and hydrology institutes in Beijing.
Nina was notable in meteorological records for its rapid intensification in the Western Pacific basin and for producing one of the deadliest flood-related dam failures in the 20th century, prompting scrutiny by institutions such as the World Meteorological Organization. The storm's intensity parameters were cataloged by the Joint Typhoon Warning Center, the Japan Meteorological Agency, and archived in datasets used by the International Best Track Archive for Climate Stewardship and research units at the University of Hawaii at Manoa and Scripps Institution of Oceanography. The name Nina, part of the Western Pacific typhoon naming list coordinated historically by the Escuela Naval (Philippines)-era lists and later regional committees, was retired in many naming lists due to the storm's severity; subsequent naming conventions were adjusted by the ESCAP/WMO Typhoon Committee and national meteorological services.
Post-event analyses published by research bodies such as the Chinese Academy of Sciences, National Oceanic and Atmospheric Administration, and university departments at Peking University and National Taiwan University examined factors including reservoir design under extreme precipitation, interactions between Nina and the Meiyu front, antecedent soil moisture, and the influence of contemporaneous sea surface temperatures in the Kuroshio Current region. The disaster influenced flood management policy in the People's Republic of China, spurred revisions to dam safety legislation in provincial assemblies, and shaped regional cooperation on early warning systems involving the World Meteorological Organization, the United Nations Office for the Coordination of Humanitarian Affairs, and national agencies. Nina remains a case study in hydrology, emergency management, and civil engineering curricula at institutions such as the Tsinghua University and National Cheng Kung University and continues to inform modern resilience planning in East Asia.
Category:Typhoons in the Philippines Category:1975 Pacific typhoon season