<?xml version="1.0" encoding="UTF-8"?>
<document>
<title>Typhoon Tip</title>
<authors>Wikipedia</authors>
<publisher>wikipedia.org</publisher>
<publishedplace>network</publishedplace>
<publishedyear>2010</publishedyear>
<edition></edition>
<category>Featured articles</category>
<section id="27405" fatherid="0" title="" lv="" priority="-1" level="1">
Typhoon Tip (international designation: 7920, JTWC designation: 23W) was the largest and most intense tropical cyclone on record. The nineteenth tropical storm and twelfth typhoon of the 1979 Pacific typhoon season, Tip developed out of a disturbance in the monsoon trough on October 4 near Pohnpei. Initially, a tropical storm to its northwest hindered the development and motion of Tip, though after it tracked further north Tip was able to intensify. After passing Guam, it rapidly intensified and reached peak winds of 305 km/h (190 mph)All wind speeds in the article are maximum sustained winds sustained for one minute, unless otherwise noted. and a worldwide record low sea-level pressure of 870 mbar (hPa, 25.69 inHg) on October 12. At its peak strength, it was also the largest tropical cyclone on record with a diameter of 2,220 km (1,380 mi). It slowly weakened as it continued west-northwestward, and later turned to the northeast under the influence of an approaching trough. Tip made landfall on southern Japan on October 19, and became an extratropical cyclone shortly thereafter.
U.S. Air Force Reconnaissance flew into the typhoon for 60 missions, making Tip one of the most closely observed tropical cyclones. Rainfall from the typhoon breached a flood-retaining wall at a United States Marine Corps training camp in the Kanagawa Prefecture of Japan, leading to a fire which killed 13 Marines and injured 68. Elsewhere in the country, the typhoon led to widespread flooding and 42 deaths, and offshore shipwrecks  44 killed or missing.

</section>
<section id="27406" fatherid="0" title="Meteorological history" lv="" priority="2" level="1">
Three circulations developed within the monsoon trough that extended from the Philippines to the Marshall Islands. A disturbance to the southwest of Guam developed into Tropical Storm Roger on October 3, and later on the same day the tropical disturbance which would later become Typhoon Tip developed to the south of Pohnpei. Strong flow from across the equator was drawn into the circulation of Roger, initially preventing significant development of the disturbance that would become Tip. Despite the unfavorable air pattern, the tropical disturbance near Pohnpei gradually organized as it moved westward. Due to the large-scale circulation pattern into Tropical Storm Roger, the tropical disturbance moved erratically and slowly executed a cyclonic loop to the southeast of Chuuk. A Reconnaissance Aircraft flight into the system late on October 4 confirmed the existence of a closed low-level circulation, and early on October 5 the Joint Typhoon Warning Center (JTWC) issued its first warning on Tropical Depression Twenty-Three.
While executing a loop near Chuuk, the tropical depression intensified into Tropical Storm Tip, though the storm failed to organize significantly due to the influence of Tropical Storm Roger. Reconnaissance Aircraft provided the track of the surface circulation, since satellite imagery estimated the center was located about 60 km (38 mi) from its true position. After drifting erratically for several days, Tip began a steady northwest motion on October 8. By that time, Tropical Storm Roger had become an extratropical cyclone, resulting in the southerly flow to be entrained into Tip. Additionally, an area of the Tropical Upper Tropospheric Trough moved to the north of Guam, providing an excellent outflow channel north of Tip. Initially, the storm was predicted to continue northwestward and make landfall on Guam, though early on October 9 it turned to the west, passing about 45 km (28 mi) south of the island. Later that day, Tip intensified to attain typhoon status.
As a result of very favorable conditions for development, Typhoon Tip rapidly intensified in the open waters of the western Pacific Ocean. Late on October 10, the typhoon attained the equivalence of a Category 4 on the Saffir-Simpson Hurricane Scale, and the next day it became a super typhoon. The central pressure dropped 92 mbar (hPa, 2.71 inHg) from October 9 to 11, during which the circulation pattern of Typhoon Tip increased to a record diameter of 2,220 km (1,380 mi). The typhoon continued to intensify further, and early on October 12 Reconnaissance Aircraft recorded a worldwide record-low pressure of 870 mbar (hPa, 25.69 inHg) with winds of 305 km/h (190 mph), located about 840 km (520 mi) west-northwest of Guam. In its best track, the Japan Meteorological Agency listed Tip as peaking with 10-minute sustained winds of 160 mph (260 km/h). At the time of its peak strength, its eye was 15 km (9.3 mi) wide.
After peaking in intensity, Tip weakened to a 230 km/h (145 mph) typhoon and remained at that intensity for several days as it continued west-northwestward. For five days after reaching its peak strength, the average radius of winds stronger than 55 km/h (35 mph) extended over 1,100 km (685 mi). On October 17, Tip began to steadily weaken as its size reduced, and the next day it began recurving northeastward under the influence of a mid-level trough. After passing about 65 km (45 mi) east of Okinawa, it accelerated its forward motion to 75 km/h (46 mph). On October 19 Tip made landfall on the Japanese island of Honshū with winds of about 130 km/h (80 mph). The typhoon continued rapidly northeastward through the country and became an extratropical cyclone over northern Honshū a few hours after moving ashore. The extratropical remnant of Tip continued northeastward and gradually weakened, crossing the International Date Line on October 22. It was last observed near the Aleutian Islands near Alaska.

</section>
<section id="27407" fatherid="0" title="Impact" lv="" priority="-3" level="1">
Image:Typhoonsizes.jpg||frame|The relative sizes of the United States, Typhoon Tip and Cyclone Tracy (the largest and one of the smallest tropical cyclones recorded, respectively)
The typhoon produced heavy rainfall early in its lifetime while passing near Guam, including a total of 23.1 cm (9.09 in) at Andersen Air Force Base. The outer rainbands of the large circulation of Tip produced moderate rainfall in the mountainous regions of the Philippine island of Luzon.
Heavy rainfall from the typhoon breached a flood-retaining wall at Camp Fuji, a training facility for the United States Marine Corps near Yokosuka. Marines inside the camp weathered the storm inside huts situated at the base of a hill which housed a fuel farm. The breach led to hoses being dislodged from two rubber storage bladders, releasing large quantities of fuel. The fuel flowed down the hill and was ignited by a heater used to warm one of the huts. The resultant fire killed thirteen Marines, injuring 68, and causing moderate damage to the facility. The facility's barracks were destroyed, along with fifteen huts and several other structures. Fire departments from nearby locations arrived within two hours. The barracks were rebuilt, and a memorial was established for those who lost their lives in the fire.

During recurvature, Typhoon Tip passed about 65 km (40 mi) east of Okinawa. Sustained winds reached 72 km/h (44 mph), with gusts to 112 km/h (69 mph). Sustained winds in Japan are unknown, though they were estimated at minimal typhoon strength. The passage of the typhoon through the region resulted in millions of dollars in damage to the agricultural and fishing industries of the country. Eight ships were grounded or sunk by Tip, leaving 44 fishermen dead or unaccounted for. A Chinese freighter broke in half as a result of the typhoon, though its crew of 46 were rescued. The rainfall led to over 600 mudslides throughout the mountainous regions of Japan and flooded more than 22,000 homes; 42 people died throughout the country, with another 71 missing and 283 injured. River embankments broke in 70 places, destroying 27 bridges, while about 105 dikes were destroyed. Following the storm, at least 11,000 people were  homeless. Transportation in the country was disrupted; 200 trains and 160 domestic airline flights were canceled. Tip was described as the most severe storm to strike Japan in 13 years.

</section>
<section id="27408" fatherid="0" title="Records and meteorological statistics" lv="" priority="4" level="1">
Typhoon Tip was the largest tropical cyclone on record, with a diameter of 1,380 mi (2,220 km)—almost double the previous record of 700 miles (1,130 km) set by Typhoon Marge in August 1951. At its largest, Tip was nearly as large as half of the continental United States. At its peak intensity, the temperature inside the eye of Typhoon Tip was 30° C (86° F) and described as exceptionally high. With 10-minute sustained winds of 160 mph (260 km/h), Typhoon Tip is the strongest cyclone in the complete tropical cyclone listing by the Japan Meteorological Agency.
The typhoon was also the most intense tropical cyclone on record with a pressure of 870 mbar (hPa, 25.69 inHg), 6 mbar (hPa, 0.17 inHg) lower than previous record set by Super Typhoon June in 1975. The records set by Tip still stand. However, due to the end of routine Reconnaissance Aircraft in the western Pacific Ocean in August 1987, modern researchers questioned if Tip is the strongest on record. After a detailed study, three researchers determined two typhoons, Angela in 1995 and Gay in 1992, maintained higher Dvorak numbers than Tip, and believed that one or both of the two may have been more intense than Tip. Also, Cyclone Monica of 2006 was rated at 869 mb by Dvorak classifications, although this was dismissed as the source was unofficial. So far, due to lack of direct observations, it is unknown if Tip maintains the world record. Despite the intensity and damage, the name was not retired. As such, the name was reused in 1983, 1986, and 1989.

</section>
<section id="27409" fatherid="0" title="See also" lv="" priority="-5" level="1">
</section>
<section id="27410" fatherid="0" title="Notes" lv="" priority="-6" level="1">
</section>
<section id="27411" fatherid="0" title="References" lv="" priority="-7" level="1">
Category:1979 Pacific typhoon season
Category:Typhoons in Japan
Typhoon Tip
Typhoon Tip
Category:Typhoons in Guam
Category:Typhoons
zh-yue:颱風泰培

</section>
</document>
