How many hours did the storm which surpassed Typhoon Nora in 2015, grow from a tropical storm to a Category 5 hurricane?
Typhoon Nora (1973) Typhoon Nora was the fourth-most intense tropical cyclone on record. Originating from an area of low pressure over the western Pacific, Nora was first identified as a tropical depression on October 2, 1973. Tracking generally westward, the system gradually intensified, attaining typhoon status the following evening. After turning northwestward, the typhoon underwent a period of rapid intensification, during which its central pressure decreased by 77 mb (hPa; 2.27 inHg) in 24 hours. At the end of this phase, Nora peaked with winds of 295 km/h (185 mph) and a pressure of 877 mb (hPa; 25.91 inHg), making it the most-intense tropical cyclone on record (alongside Typhoon Ida in 1958) at the time; however, this pressure has since been surpassed by two other typhoons and one hurricane. The typhoon subsequently weakened and turned northwestward as it approached the Philippines. After brushing Luzon on October 7, the system passed south of Taiwan and ultimately made landfall in China on October 10. Once onshore, Nora quickly weakened and dissipated the following day.
Typhoon Flo (1990) Typhoon Flo, known in the Philippines as Typhoon Norming, was a powerful Category 5 typhoon that killed over 30 people and caused over $4 billion (1990 USD) in damages when it struck Honshū, Japan in mid-September 1990. The twelfth typhoon and first super typhoon of the 1990 Pacific typhoon season, it formed on September 8, as Tropical Depression 20W. It reached typhoon status on September 15, 1990. It rapidly intensified on the 16th and 17th to a 165 mph super typhoon near Okinawa. Vertical shear weakened it as it recurved to the northeast, and Flo hit Honshū on the 19th as a 155 km/h (100 mph) typhoon. It continued rapidly northeastward, became extratropical on the 20th, and dissipated on the 22nd.