 Typhoon Kathy's surface analysis on August 20, 1964. | |
| Meteorological history | |
|---|---|
| Formed | August 10, 1964 |
| Dissipated | August 25, 1964 |
| Violent typhoon | |
| 10-minute sustained (JMA) | |
| Highest winds | 215 km/h (130 mph) |
| Lowest pressure | 948 hPa (mbar); 27.99 inHg |
| Category 4-equivalent super typhoon | |
| 1-minute sustained (SSHWS/JTWC) | |
| Highest winds | 240 km/h (150 mph) |
| Lowest pressure | 954 hPa (mbar); 28.17 inHg |
| Overall effects | |
| Fatalities | 75 |
| Damage | Unknown |
| Areas affected | Japan, Ryuku Islands |
Part of the 1964 Pacific typhoon season | |
Typhoon Kathy, known in the Philippines as Typhoon Welpring, was the largest and longest-lived typhoon in 1964. As the fourteenth named storm of the season, it originated from an area of circulation southeast of Japan by August 11. The following day, the system strengthened into a tropical storm, gaining the name Kathy. Kathy reached typhoon strength on August 13, passing south of Tokyo, approaching the Ryukyu Islands. The typhoon's winds peaked at 165 km/h (103 mph) on August 14, before tapering as the storm curved west-southwest. For the next four days, Kathy and nearby Typhoon Marie began a Fujiwhara interaction, causing both storms to rotate around each other, which ended when Marie was pulled into Kathy's circulation. Between August 15 and August 16, Kathy weakened into a tropical storm, before strengthening back to typhoon status. The storm's west-southwest path brought the center across the Ryukyu Islands and near Okinawa on August 16 as Kathy began to execute a loop in its track. Two days later, Kathy's winds were estimated by the JTWC to be around 215 km/h (134 mph). The typhoon's track made a smaller loop on August 20, before heading northwards. On August 23, Kathy made landfall in Japan with winds of 130 km/h (81 mph) and weakened to a tropical storm. It then curved northeast. On August 25, Kathy transitioned into an extratropical cyclone and continued northeast, reaching the Bering Strait on September 1. Due to its lifetime and large size, the Joint Typhoon Warning Center issued warnings for 13+1⁄2 days, and the storm's circulation reached a radius of 1,370 kilometres (850 mi).[1]: 59
- ^ Cassidy, Richard M., ed. (February 15, 1964). Annual Typhoon Report, 1964 (PDF) (Report). Annual Typhoon Report. Guam, Mariana Islands: Fleet Weather Central/Joint Typhoon Warning Center. Retrieved June 12, 2020.