Typhoon Betty, known in the Philippines as Typhoon Aring, was the strongest typhoon to strike the Philippines in ten years. An area of disturbed weather developed on October 27, 1980, near Truk Atoll. After turning east from south, the disturbance was classified as a tropical storm on October 29 as it passed near Guam, causing only minor damage. Following a turn to the west-northwest, Betty attained typhoon intensity the next day. On November 4, Betty peaked in intensity. Later that day, Betty moved ashore over Luzon, introducing a rapid weakening trend. Over land, Betty then began to turn north due to a weakening subtropical ridge to its north and a trough offshore Taiwan. By November 8, Betty, after moving offshore, had completed its transition into an extratropical cyclone, and dissipated that same day.
Across the Philippines, 101 casualties were reported. More than 29,000 homes were damaged and over 5,000 houses were leveled, resulting in 229,000 people homeless. A total of 70 villages sustained flooding. In all, Typhoon Betty inflicted $181 million (1980 USD) in damage, with $43.1 million from crops, $116 million from public property, and $21.7 million from private property. Following the storm, 11 provinces were declared a disaster area.
Meteorological history
Typhoon Betty, one of five tropical cyclones to develop in the Western Pacific basin during October 1980, originated from a tropical disturbance that was first noticed on October 22. Five days later, the disturbance began to show signs of organization while it was located to the south of Truk Atoll. At 00:00 UTC on October 28, the Japan Meteorological Agency (JMA) upgraded the system to a tropical depression. Based on surface observations and data from a Hurricane Hunter aircraft, the Joint Typhoon Warning Center (JTWC) issued a Tropical Cyclone Formation Alert (TCFA) at 08:00 UTC. After initially moving south, the disturbance turned east as it approached Truk Atoll. Following an increase in the disturbance's organization, the JTWC classified the system as Tropical Depression 25 on October 29 while the JMA upgraded it to a tropical storm. Six hours later, the JTWC upgraded the depression into Tropical Storm Betty.
After moving erratically during its formative stages, Tropical Storm Betty accelerated towards the west-northwest as it passed south of Guam. Late on October 29, the JMA designated Betty a severe tropical storm. Twenty-four hours later, the JTWC upgraded Betty into a typhoon, with the JMA doing the same at 00:00 UTC on October 31. Twelve hours later, the JTWC raised the winds to , equal to a low-end Category 2 hurricane on the United States-based Saffir-Simpson Hurricane Wind Scale (SSHWS). On November 1, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) also began to track the storm and assigned it with the local name Aring. After turning due west, Betty continued to intensify, although a Hurricane Hunter penetration later on November 1 indicated no eyewall. Early on November 2, synoptic data showed a shortwave trough moving off Asia. As such, the JTWC expected Betty to re-curve near the 125th meridian east. Instead, Typhoon Betty abruptly turned southwestward. On November 3, the trough moved quickly eastward north of the system, closing Betty's window for re-curvature. Following the formation of an eye, the JMA estimated that the typhoon peaked in intensity the next day, with winds of and a barometric pressure of . Later that day, the JTWC estimated an intensity of .
By 00:00 UTC on November 4, the JTWC amended its forecast for Typhoon Betty, projecting it to move northwest into southern Luzon and China. At 16:00 UTC that day, Betty made landfall in central Luzon south of Cape San Ildefonso, with the JTWC reporting winds of and the JMA estimating winds of . As Betty weakened over land, a subtropical ridge to Betty's north broke down. Betty began to turn north in response to a shortwave through offshore Taiwan. According to both the JTWC and JMA, the cyclone had weakened below typhoon intensity once it moved back over water. Betty never regained its past intensity as it drifted northward, and at 00:00 UTC on November 8, Betty was declared an extratropical system by the JTWC. Twelve hours later, the JMA ceased tracking the system, while the cyclone was located southeast of Honshu.
Preparations and impact
During its formative stages, Betty passed near Guam, where strong winds caused major crop damage and downed power lines. On October 30, the Antonio B. Won Pat International Airport was closed. Although there was no major damage on Guam, typhoon alerts were issued for Yap and Palau.