Typhoon (JMA scale) | |
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Category 1 (Saffir–Simpson scale) | |
Typhoon Dan on October 13, 1989
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Formed | October 6, 1989 |
Dissipated | October 13, 1989 |
Highest winds |
10-minute sustained: 140 km/h (85 mph) 1-minute sustained: 130 km/h (80 mph) |
Lowest pressure | 960 hPa (mbar); 28.35 inHg |
Fatalities | 101 total |
Damage | $59.2 million (1989 USD) |
Areas affected | Philippines and Vietnam |
Part of the 1989 Pacific typhoon season |
Typhoon Dan, known in the Philippines as Typhoon Saling, was the third of a series of tropical cyclones that impacted the Philippines and Vietnam in October 1989. The storm developed on October 6, and tracked generally westward throughout its course. After crossing Luzon, the typhoon emerged into the South China Sea and reached its peak intensity, with sustained 10-minute winds of 140 km/h (85 mph), 1-minute winds of 130 km/h (80 mph), and a minimum barometric pressure of 960 millibars. The storm moved ashore in central Vietnam and dissipated after moving inland. The storm caused extensive damage throughout its course. In the Philippines, Dan left hundreds of thousands homeless and killed 58 people. Power outages were extensive in the Manila region. In Vietnam, the storm's high winds and heavy rains caused extensive damage and loss of life. More than 500,000 structures were damaged or destroyed and at least 43 people were killed across the country.
On October 6, 1989, a tropical disturbance formed in the monsoon trough near the island of Chuuk. An advisory by the Joint Typhoon Warning Center (JTWC) assessed the system as having a "poor" chance to develop due to strong wind shear in the region. A day later, the potential of development was adjusted to "fair". On October 8, the wind shear relented and a well-defined band persisted near the storm's center of circulation. As a result, a Tropical Cyclone Formation Alert was issued. That same day, the Japan Meteorological Agency (JMA) classified the storm as a tropical depression. At 1200 UTC, the JTWC issued their first warning on Tropical Depression 29W. At the time, it was centered about 70 mi (110 km) northeast of Yap.
About 18 hours later, the depression was upgraded to a tropical storm and given the name Dan. The cyclone moved westward at 17 to 23 mph (27 to 37 km/h), and convection continued to mature. Outflow was good across most of the system, except the northwestern corner where it was restricted by interaction with a nearby typhoon. Due to the cyclone's proximity to the Philippines, the Philippine Atmospheric, Geophysical and Astronomical Services Administration also monitored the storm, assigning it with the local name Saling. The JMA upgraded it to a tropical storm on October 9; both agencies recognized it as a typhoon the next day after an eye became visible and outflow improved in the northwestern quadrant. Dan made landfall on the southeastern coast of Luzon in the Philippines, and its center tracked just south of the Ninoy Aquino International Airport.