Typhoon Gerald

Typhoon Gerald, known in the Philippines as Typhoon Neneng, affected the Philippines, Taiwan, and China during September 1987. A tropical depression developed on September 4, and within 24 hours, intensified into a tropical storm. After initially moving erratically within the Philippine Sea, Gerald moved west-northwest and then northwest while steadily deepening. Gerald obtained typhoon intensity on September 8, and the following day, attained maximum intensity. Shortly thereafter, the typhoon skirted southwestern Taiwan, which resulted in a steady weakening trend. On September 10, Gerald moved ashore north of Hong Kong near Amoy. Gerald dissipated the next day.

Typhoon Gerald (Neneng)
Typhoon (JMA scale)
Category 3 typhoon (SSHWS)
Typhoon Gerald on September 9
FormedSeptember 4, 1987
DissipatedSeptember 11, 1987
Highest winds10-minute sustained: 150 km/h (90 mph)
1-minute sustained: 195 km/h (120 mph)
Lowest pressure950 hPa (mbar); 28.05 inHg
Fatalities127
Damage$134.48 million (1987 USD)
Areas affectedPhilippines, Taiwan, South-Central China
Part of the 1987 Pacific typhoon season

Across the Philippines, the storm caused $4.48 million (1987 USD) in damage but no deaths. Although the system stayed offshore Taiwan, the storm inflicted widespread flooding across the island that took five lives. There, 5,000 families were left without power, and damage exceeded $10 million. Although Gerald weakened considerably prior to making landfall, the storm was still responsible for extensive damage in the Fujian Province, where 76 people perished, and 31 others suffered injuries. In the neighboring Zhejiang Province, 28 people were killed and 71 others sustained injuries. Across China, 4,900 homes were destroyed and 122 fatalities were reported. Damage in the country amounted to $120 million.

Meteorological history
Map plotting the track and the intensity of the storm, according to the Saffir–Simpson scale

Typhoon Gerald, one of three typhoons to form from the monsoon trough in early September 1987, originated from an area of low pressure that developed to the east of the Philippines over the South China Sea.[1] The Joint Typhoon Warning Center (JTWC) started tracking the low at 06:00 UTC on September 2, after convection persisted. Two and a half hours later, the agency issued a Tropical Cyclone Formation Alert (TCFA), but almost immediately thereafter, shower and thunderstorm activity rapidly diminished due to decreased poleward outflow and increased wind shear.[1] Despite this, the Japan Meteorological Agency (JMA) started tracking the system at 00:00 UTC on September 3.[2][nb 1] Eight hours later, the TCFA was cancelled.[1]

Although the low initially exhibited features typical of a monsoon trough, surface observations suggested that surface pressures in the vicinity of the low began to fall on September 4. Consequently, the TFCA was re-issued at 10:00 UTC.[1] Eight hours later, Dvorak intensity estimates for the storm reached T2.0/30 mph (50 km/h), prompting the JTWC to upgrade the system into a tropical depression,[1] although post-storm analysis from the agency indicated that the system attained tropical depression status at 00:00 UTC on September 4 and tropical storm intensity at 18:00 UTC that day. At 06:00 UTC on September 5, the JMA followed suit and classified Gerald as a tropical storm.[4][nb 2] Meanwhile, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) also monitored the storm and assigned it with the local name Neneng.[6] The JTWC initially expected Gerald to re-curve east of the Philippines; however, the storm's circulation remained quite shallow and embedded within the monsoon trough, causing Gerald to meander.[1] The JMA upgraded Gerald into severe tropical storm during the evening hours of September 5.[2]

After meandering offshore the Philippines during the storm's formative stages,[1] Gerald began to turn west-northwest[7] and then north-northwest on September 7. Subsequently, the JTWC revised its forecasts, and called for Gerald to track through the Luzon Strait and eventually move into China. Gerald also started to intensify at a faster clip.[1] At 00:00 UTC on September 7, the JTWC reported that Gerald reached typhoon intensity,[8] with the JMA doing the same a mere 12 hours later[4] as an eye first became evident on satellite imagery.[7] Midday on September 8, the JTWC increased the intensity of the typhoon to 185 km/h (115 mph), equal to Category 3 intensity on the United States-based Saffir–Simpson hurricane wind scale.[8] Several hours later, the JTWC estimated that Gerald reached its peak intensity of 195 km/h (120 mph).[1] At the same time, the JMA indicated that Gerald attained winds of 145 km/h (90 mph), its peak intensity, and a minimum barometric pressure of 950 mbar (28 inHg).[2] While at peak intensity, Typhoon Gerald exhibited an 110 km (70 mi) wide eye – unusually large for a tropical cyclone that season.[1]

Shortly after its peak, Gerald began to interact with the southwestern coast of Taiwan. This greatly reduced the storm's low-level inflow, which resulted in considerable weakening.[1] Late on September 9, Gerald passed about 20 km (12 mi) south of the southern tip of Taiwan, and early the following morning, tracked 15 km (9.3 mi) west of the island of Magong.[7] The weakening trend persisted as the typhoon entered the Formosa Straits,[1] and at 00:00 UTC on September 10, the JMA downgraded Gerald into a severe tropical storm.[2] Six hours later, the JTWC reported that Gerald was no longer a typhoon.[8] Late on September 10, Gerald made landfall less than 100 km (60 mi) northeast of Amoy.[1][7] At the time of landfall, the JTWC estimated that Gerald had weakened into a tropical depression,[8] and the JMA had stopped classifying the storm altogether.[2] At 00:00 UTC on September 11, the JTWC ceased following the storm as it was no longer identifiable by surface observations or via satellite imagery.[1]

Preparations, impact, and aftermath

During its formative stages of the typhoon, 177 people – or 32 families – were either homeless or evacuated to shelters in the Philippines.[9] There, damage totaled $4.48 million, with $2.52 million from public infrastructure and $1.94 million from agriculture. However, there were no casualties.[10][nb 3] Although Gerald did not make landfall in Taiwan, it came close enough to deliver heavy rains and strong winds to the island. Five people were killed. Along the eastern and southeastern coasts portion of Taiwan, roads were cut off due to falling debris and mudslides. Two young boys died due to flash flooding in the capital of Taipei. A worker at a nuclear power plant in the southern tip of the island died due to head injuries suffered during the storm. Two fishermen near Hualien drowned due to storm surge. During the height of the storm, 5,000 households lost power. Overall, five people were killed[11] and damage exceeded $10 million.[1]

Typhoon Gerald brought up to 510 mm (20 in) of rain to the Fujian Province, with the cities of Ningde, Fuzhou, Putian, Quanzhou, Xiamen, Zhangzhou receiving the worst damage of the storm.[12] Throughout the province, 67 people were killed and 31 other people were injured,[13] many seriously,[14] while 126,610 ha (312,865 acres) of crops were damaged.[13] Most of the casualties in the province occurred due to collapsed homes.[14] In the neighboring province of Zhejiang, 28 others died and 71 were injured. There, the storm flooded 126,610 ha (312,865 acres) of crops[13] and destroyed 700 homes. A highway tunnel in Huangyan County collapsed, burying at least 12 people, six of whom were rescued.[12] Most of the district was also isolated from the outside world due to flooding along the Qiantang River. Throughout the Zhejian province, thousands of bridges, dikes and communications equipment were destroyed.[15] Nationwide, 4,900 dwellings were demolished,[16] 102 people sustained injuries,[17] and 122 fatalities occurred.[1] Damage in the country amounted to $120 million.[18] Further south, the storm came close enough to Hong Kong to require a No 1. hurricane signal for about 23 hours starting on September 9. Citywide, the highest recorded wind gust of 87 km/h (54 mph) occurred at Tate's Cairn. The Hong Kong Royal Observatory also reported a minimum pressure of 1,000.8 mbar (29.55 inHg) while Cheung Chau received 16.5 mm (0.65 in) of rain in a five-day time span. Throughout Hong Kong, there were no deaths or damages.[7] Following the storm, the Chinese army was mobilized to provide food and supplies to an estimated 25,400 people that were left homeless.[14]

See also

Notes
  1. The Japan Meteorological Agency is the official Regional Specialized Meteorological Center for the western Pacific Ocean.[3]
  2. Wind estimates from the JMA and most other basins throughout the world are sustained over 10 minutes, while estimates from the United States-based Joint Typhoon Warning Center are sustained over 1 minute. 10‑minute winds are about 1.14 times the amount of 1‑minute winds.[5]
  3. All Philippine currencies are converted to United States Dollars using Philippines Measuring worth with an exchange rate of the year 1987.

References
  1. Joint Typhoon Warning Center; Naval Pacific Meteorology and Oceanography Center (1988). Annual Tropical Cyclone Report: 1987 (PDF) (Report). United States Navy, United States Air Force. Retrieved May 11, 2017.
  2. Japan Meteorological Agency (October 10, 1992). RSMC Best Track Data – 1980–1989 (Report). Archived from the original (.TXT) on December 5, 2014. Retrieved May 11, 2017.
  3. "Annual Report on Activities of the RSMC Tokyo – Typhoon Center 2000" (PDF). Japan Meteorological Agency. February 2001. p. 3. Retrieved May 11, 2017.
  4. Kenneth R. Knapp; Michael C. Kruk; David H. Levinson; Howard J. Diamond; Charles J. Neumann (2010). 1987 Gerald (1987245N15133). The International Best Track Archive for Climate Stewardship (IBTrACS): Unifying tropical cyclone best track data (Report). Bulletin of the American Meteorological Society. Archived from the original on March 27, 2016. Retrieved May 11, 2017.
  5. Christopher W Landsea; Hurricane Research Division (April 26, 2004). "Subject: D4) What does "maximum sustained wind" mean? How does it relate to gusts in tropical cyclones?". Frequently Asked Questions:. National Oceanic and Atmospheric Administration's Atlantic Oceanographic and Meteorological Laboratory. Retrieved May 11, 2017.
  6. Padua, Michael V. (November 6, 2008). PAGASA Tropical Cyclone Names 1963–1988 (Report). Typhoon 2000. Retrieved May 12, 2017.
  7. "Part III – Tropical Cyclone Summaries". Meteorological Results: 1987 (PDF) (Report). Hong Kong Royal Observatory. 1988. Retrieved May 11, 2017.
  8. Typhoon 14W Best Track (Report). Joint Typhoon Warning Center. December 17, 2002. Retrieved May 11, 2017.
  9. Typhoon Neneng: Destructive Typhoons 1970-2003 (Report). National Disaster Coordinating Council. November 9, 2004. Archived from the original on March 15, 2005. Retrieved May 28, 2017.
  10. "Destructive Typhoons 1970-2003". National Disaster Coordinating Council. November 9, 2004. Archived from the original on November 9, 2004. Retrieved May 28, 2017.
  11. "Typhoon strikes Taiwan, killing at least three". United Press International. September 9, 1987.  – via Lexis Nexis (subscription required)
  12. "Foreign News Briefs". United Press International. September 12, 1987.  – via Lexis Nexis (subscription required)
  13. "Typhoon Kills 95 in Eastern China". Associated Press. September 13, 1987.  – via Lexis Nexis (subscription required)
  14. "Typhoon kills 95 in China". United Press International. September 14, 1987.  – via Lexis Nexis (subscription required)
  15. "China typhoon death toll rises". United Press International. September 19, 1987.  – via Lexis Nexis (subscription required)
  16. Disaster History: Significant Data on Major Disasters Worldwide, 1900–Present (PDF) (Report). Washington D.C., United States: United States Agency for International Development. August 1993. p. 49. Retrieved May 12, 2017.
  17. "Typhoon Kills 95 in Beijing". Gadsden Times. Associated Press. September 14, 1987. Retrieved May 28, 2017.
  18. Centre for Research on the Epidemiology of Disasters. "EM-DAT: The Emergency Events Database". Université catholique de Louvain.
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