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 Nangka (2015) Typhoon Nangka was a large and strong tropical cyclone that impacted central Japan in July 2015. Nangka started its long-living journey as a tropical disturbance over the Marshall Islands and west of the International Dateline, becoming the eleventh named storm of the annual typhoon season on July 3. It quickly intensified while moving to the west-northwest, attaining typhoon status on July 6. Nangka moved through the Northern Marianas Islands, passing directly over the uninhabited island of Alamagan. Shortly thereafter, the typhoon attained peak winds; the Japan Meteorological Agency (JMA) estimated 10‑minute sustained winds of 185 km/h (115 mph), while the unofficial Joint Typhoon Warning Center (JTWC) estimated 1‑minute winds of 250 km/h (155 mph), making it a super typhoon. Nangka later weakened as it curved to the north, moving across central Japan on July 16 as a minimal typhoon. The storm weakened soon after, dissipating in the Sea of Japan on July 18.