Super Typhoon Joan, known in the Philippines as Typhoon Sening, was the first of two super typhoons to strike the Philippines within a week in October 1970, the second being Super Typhoon Kate.
 Super Typhoon Joan is the second strongest typhoon and the tenth deadliest storm, ever to affect the Philippines, just after Typhoon Haiyan in 2013.
Typhoon Joan of October 1997 was the longest-lasting super typhoon at the time, maintaining 1-minute maximum sustained winds of at least 240 km/h (150 mph) for 4.5 days.
 Joan, concurrently with Typhoon Ivan to its west, also became the strongest typhoons at the same time in the northwest Pacific Ocean.
 The 25th named storm during the active 1997 Pacific typhoon season, Joan developed from the same trough as Typhoon Ivan on October 11.
 It moved northwestward and later to the west, undergoing explosive deepening to its peak intensity on October 15.
 One typhoon warning agency estimated that Joan was among the strongest storms on record in the basin, and that Ivan and Joan marked the first occurrence of simultaneous super typhoons.
 While near peak intensity, Joan passed between Anatahan and Saipan in the Northern Marianas Islands.
 Later, the typhoon weakened and turned to the north and east, becoming extratropical on October 24.
Typhoon Shanshan, known in the Philippines as Typhoon Luis, was a strong typhoon that affected parts of East Asia in late September 2006.
 The 13th named storm of the 2006 Pacific typhoon season, Typhoon Shanshan was also the seventh typhoon of the year operationally recognised by the Japan Meteorological Agency.
 In post-operational analysis Shanshan became the eighth typhoon of the year when Typhoon Maria was added to the list.
 The Joint Typhoon Warning Center considered Shanshan the 13th tropical storm and eighth typhoon of the season, a Category 4-equivalent typhoon in terms of 1-minute average wind speed.
 The name "Shanshan" was submitted to the naming list by Hong Kong and is a girls' given name.
Typhoon Rusa was the most powerful typhoon to strike South Korea in 43 years.
 It was the 21st JTWC tropical depression, the 15th named storm, and the 10th typhoon of the 2002 Pacific typhoon season.
 It developed on August 22 from the monsoon trough in the northwestern Pacific Ocean, well to the southeast of Japan.
 For several days, Rusa moved to the northwest, eventually intensifying into a powerful typhoon.
 On August 26, the storm moved across the Amami Islands of Japan, where Rusa left 20,000 people without power and caused two fatalities.
 Across Japan, the typhoon dropped torrential rainfall peaking at 902 mm in Tokushima Prefecture.
Typhoon Francisco, known in the Philippines as Typhoon Urduja, was a powerful typhoon that strengthened to the equivalent of a Category 5 on the Saffir-Simpson scale, according to the Joint Typhoon Warning Center.
 The 25th named storm and the 10th typhoon of the 2013 Pacific typhoon season, Francisco formed on October 16 east of Guam from a pre-existing area of convection.
 With favorable conditions, it quickly intensified into a tropical storm before passing south of Guam.
 After stalling to the southwest of the island, Francisco turned to the northwest into an environment of warm waters and low wind shear, becoming a typhoon.
 The JTWC upgraded it to super typhoon status on October 18, while the Japan Meteorological Agency (JMA) estimated peak 10‑minute sustained winds of 195 km/h (120 mph).
 Gradual weakening ensued, and after the typhoon turned to the northeast, Francisco deteriorated into a tropical storm on October 24.
 Passing southeast of Okinawa and mainland Japan, the storm accelerated and became extratropical on October 26, dissipating later that day.
Typhoon Nabi (] ), known in the Philippines as Typhoon Jolina, was a powerful typhoon that struck southwestern Japan in September 2005.
 The 14th named storm of the 2005 Pacific typhoon season, Nabi formed on August 29 to the east of the Northern Mariana Islands.
 It moved westward and passed about 55 km (35 mi) north of Saipan on August 31 as an intensifying typhoon.
 On the next day, the Joint Typhoon Warning Center upgraded the storm to super typhoon status, with winds equivalent to that of a Category 5 hurricane on the Saffir-Simpson Hurricane Scale.
 The Japan Meteorological Agency estimated peak ten-minute winds of 175 km/h (110 mph) on September 2.
 Nabi weakened while curving to the north, striking the Japanese island of Kyushu on September 6.
 After brushing South Korea, the storm turned to the northeast, passing over Hokkaido before becoming extratropical on September 8.
Typhoon Mireille, known in the Philippines as Typhoon Rosing, was the costliest typhoon on record, striking Japan in September 1991.
 The 20th named storm of the 1991 Pacific typhoon season, Mireille formed on September 13 from the monsoon trough near the Marshall Islands.
 It moved westward for several days as a small system, steered by the subtropical ridge to the north.
 The storm rapidly intensified to typhoon status on September 16, and several days later passed north of Saipan in the Northern Marianas Islands.
 Mireille intensified further after deleterious effects from a nearby tropical storm subsided.
 On September 22, the American-based Joint Typhoon Warning Center (JTWC) estimated maximum 1‑minute sustained winds of 240 km/h (150 mph), and on the next day, the official Japan Meteorological Agency (JMA) estimated 10‑minute sustained winds of 185 km/h (115 mph).
 The typhoon weakened slightly while turning northward, passing just east of Miyako-jima and later to the west of Okinawa.
 On September 27, Mireille made landfall near Nagasaki in southwestern Japan with winds of 175 km/h (110 mph), the strongest since Typhoon Nancy in 1961.
 The storm accelerated to the northeast through the Sea of Japan, moving over Hokkaido before becoming extratropical on September 28.
 The remnants of Mireille continued to the east, passing through the Aleutian Islands of Alaska on October 1.
Typhoon Nesat, known in the Philippines as Typhoon Pedring, was the most powerful tropical cyclone to directly impact China since 2005.
 It also struck the Philippines during the 2011 Pacific typhoon season, killing 83 people.
 It is the 17th named storm, the 11th severe tropical storm, the 7th typhoon and overall, the 30th tropical cyclone to be monitored by the Japan Meteorological Agency(JMA) during the year.
 Nesat came exactly two years after Typhoon Ketsana made landfall in the Philippines as the most devastating typhoon in the 2009 Pacific typhoon season with a damage of 1.09 billion and 747 fatalities.
 Nesat was also the first of twin tropical cyclones to batter the Philippines within one week during September 2011, the second was Nalgae.
The 1997 Pacific typhoon season has no official bounds; it ran year-round in 1997, but most tropical cyclones tend to form in the northwestern Pacific Ocean between May and November.
 These dates conventionally delimit the period of each year when most tropical cyclones form in the northwestern Pacific Ocean.
 This was the most active tropical cyclone season ever recorded, with a record ten Category 5 storms forming and with an ACE of 594.11.
Typhoon Nuri, known in the Philippines as Typhoon Karen, was the 12th named storm and the seventh typhoon that was recognised by the Japan Meteorological Agency.
 The Joint Typhoon Warning Center recognised it as the 13th tropical depression, the 12th tropical storm and the 8th typhoon of the 2008 Pacific typhoon season.
 The name Nuri was submitted to the World Meteorological Organisation's Typhoon Committee by Malaysia in 2003 after the name Rusa was retired in 2002.
 The name Nuri is Malay for a blue crowned parroquet, a type of parrot.
 The name Karen was assigned by PAGASA to a tropical depression for the second time, the other time being in 2004 to Typhoon Rananim.

Question: Typhoon Joan was the 25th named storm of a season that had what ACE rating?
Answer: 594.11