1984 Pacific typhoon season

Infobox hurricane season
Basin=WPac
Year=1984
Track=1984 Pacific typhoon season summary.jpg
First storm formed=June 7
Last storm dissipated=December 11
Strongest storm name=Vanessa
Strongest storm winds=155
Strongest storm pressure=879
Total storms=27
Total hurricanes=16
Total intense=2
Fatalities=2842
five seasons=1982 1983 1984 1985 1986The 1984 Pacific typhoon season has no official bounds, but most tropical cyclones tend to form in the northwestern Pacific Ocean between May and November. [Gary Padgett. [http://www.typhoon2000.ph/garyp_mgtcs/may03sum.txt May 2003 Tropical Cyclone Summary.] Retrieved 2006-08-26.] These dates conventionally delimit the period of each year when most tropical cyclones form in the northwestern Pacific Ocean.

The scope of this article is limited to the Pacific Ocean, north of the equator and west of the international date line. Storms that form or move east of the date line and north of the equator are called hurricanes; see 1984 Pacific hurricane season. Tropical Storms formed in the entire west pacific basin were assigned a name by the Joint Typhoon Warning Center. Tropical depressions in this basin have the "W" suffix added to their number. Tropical depressions that enter or form in the Philippine area of responsibility are assigned a name by the Philippine Atmospheric, Geophysical and Astronomical Services Administration or PAGASA. This can often result in the same storm having two names.

torms

30 tropical depressions formed this year in the Western Pacific, of which 27 became tropical storms. 16 storms reached typhoon intensity, of which 2 reached super typhoon strength.

Tropical Storm Vernon

infobox hurricane small
name=Tropical Storm Vernon
category=storm
type=tropical storm


track=Vernon 1984 track.pngformed=June 9
dissipated=June 11
highest winds=40 knots (1-min)
lowest pressure=993 mbarTropical Storm Vernon, the first of the year, developed in the South China Sea on June 7. It moved northwest, and then westward in an environment of strong vertical wind shear, Vernon moved inland into Vietnam on June 10. Flooding of rice, sweet potato, and sesame crops in Quang Nam-Danang province was caused by Vernon. Combined with last year's late formation of Tropical Storm Sarah in June, this is only known time that two consecutive years had their first storm develop as late as June. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/01w.pdf Tropical Storm Vernon.] Retrieved on 2007-01-13.]

Tropical Storm Wynne

infobox hurricane small
name=Tropical Storm Wynne
category=storm
type=tropical storm


track=Wynne 1984 track.pngformed=June 19
dissipated=June 26
highest winds=60 knots (1-min)
lowest pressure=980 mbarThe monsoon trough established itself across the South China Sea eastward into the Philippine Sea on June 14. A tropical disturbance formed within this trough on June 16 in the northern Philippine Sea. Moving westward for much of its existence to the south of a narrow subtropical ridge, an upper level high developed over the strengthening low level circulation early on June 19, which became a tropical depression that day. By that evening, the cyclone had strengthened into a tropical storm. Strong upper level ridging over mainland China led to easterly vertical wind shear, which limited intensification. The cyclone passed by the southern coast of Taiwan, which caused slight weakening as it entered the South China Sea. Passing south of Hong Kong, a U. S. Naval ship and Hong Kong both reported winds of 60 knots, with gusts to 70 knots noted out at sea. Southwest flow to the south of Wynne led to flooding in Luzon, where 100 square kilometres of riceland was destroyed. Three fisherman drowned north of Luzon. Late on June 25, Wynne made landfall in China near the Luichow Peninsula, and then weakened rapidly inland. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/02w.pdf Tropical Storm Wynne.] Retrieved on 2007-02-03.]

Typhoon Alex

infobox hurricane small
name=Typhoon Alex
category=cat1
type=typhoon


track=Alex 1984 track.pngformed=July 1
dissipated=July 5
highest winds=75 knots (1-min)
lowest pressure=970 mbarOn June 28, a surface circulation formed in the Philippine Sea. Development of the system began in earnest on June 30, and a tropical depression had formed early on July 1, with tropical storm status attained later in the day. A ridge to its north eroded, allowing Alex to move north-northwest towards Taiwan. Alex became the first typhoon of the season shortly before moving across the mountainous island. On July 5, extratropical transition of Alex had begun. By late in the day, it was an extratropical cyclone along a frontal zone in the Sea of Japan. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/03w.pdf Typhoon Alex.] Retrieved on 2007-02-03.]

Tropical Storm Betty

infobox hurricane small
name=Tropical Storm Betty
category=storm
type=tropical storm


track=Betty 1984 track.pngformed=July 6
dissipated=July 9
highest winds=55 knots (1-min)
lowest pressure=983 mbarDevelopment of this system was slow within the eastern portion of the monsoon trough. By midday on July 2, the disturbance was first noted about 1020 km southwest of Guam. The system moved northwest for much of its life cycle, initially following Alex and then the southwest side of the subtropical ridge. A broad tropical depression formed on the afternoon on July 5 within the disturbed weather area, weakening as it passed over Luzon. Late on July 7, ship reports indicated the system had become a tropical storm. The cyclone moved within the radar fence of Hong Kong near its peak intensity before making landfall about 250 km to its west-southwest during the early afternoon of July 9. Weakening over the topography of China was rapid thereafter, and the system dissipated by early on July 10. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/04w.pdf Tropical Storm Betty.] Retrieved on 2007-02-03.]

Typhoon Cary

infobox hurricane small
name=Typhoon Cary
category=cat2
type=typhoon


track=Cary 1984 track.pngformed=July 7
dissipated=July 14
highest winds=90 knots (1-min)
lowest pressure=955 mbarInitiated by the tropical tropospheric trough (TUTT), an area of convection was first noted on the TUTT's difflent southeast side on July 2 near 18N 168E. The disturbance moved west-southwest and evolved into a tropical depression late on July 6 and a tropical storm soon after. The cyclone moved northwest towards a break in the subtropical ridge and reached typhoon status late on July 9 forming a large eye about 55 km in diameter. Rapid development continued for another 12 hours as it slowly moved through the ridge axis. The cyclone turned northeast late on July 10 as it began to be sheared significantly from the northwest. Shearing relented on July 11 allowing the eye to reform, this time about 75 km wide. As the typhoon progressed more poleward, increased vertical wind shear and the entrainment of cooler and drier air began its extratropical transition. By late on July 14, Cary had become an extratropical cyclone. The nontropical system then moved westward, eventually dissipating south of Japan. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/05w.pdf Typhoon Cary.] Retrieved on 2007-02-03.]

Typhoon Dinah

infobox hurricane small
name=Typhoon Dinah
category=cat4
type=typhoon


track=Dinah 1984 track.pngformed=July 24
dissipated=August 1
highest winds=125 knots (1-min)
lowest pressure=915 mbarFor two weeks after Betty and Cary, high pressure dominated the northwest Pacific, with no sign of a monsoon trough. A cold front dropped into the area from the north, and remained stationary across much of the central North Pacific just north of Wake Island for nearly a week. An area of convection along the tail of the old frontal boundary formed on July 21, and closed off a wind circulation just northwest of Wake Island. Drifting westward, the system did not develop considerably until July 23. By late on July 24, it became a tropical depression. Intensifying while moving west-southwest, the system became a typhoon late on July 25 with a 55 km wide eye. Meanwhile, Tropical Storm Ed was approaching from the northwest and the ridge north of Dinah moved east, which turned the typhoon northwest. For 48 hours between July 26 and July 28, Dinah and Ed were between 1165 km and 1670 km from one another, and fujiwara interaction did impart a slight change onto Dinah's track. On July 27, while the cyclones were at their closest approach, Dinah weakened due to the more dominant outflow from Ed. The westerly shear led to a change in track to the east-northeast for Dinah. On July 28, once the cyclones moved farther apart, Dinah restrengthened rapidly and reached its maximum intensity by noon on July 29. Moving north-northeast around the western fringe of the subtropical ridge, Dinah's motion accelerated, moving close to Marcus Island late that afternoon, causing extensive vegetation damage. The coast guard station on the island sustained US$30,000 in damage (1984 dollars) when winds reached a sustained value of 63 knots, with gusts to 89 knots. Weakening as it continued to move north-northeast, Dinah regained tropical storm status on July 31. Veering more northeast and interacting with a nearby upper trough in the Westerlies, Dinah became an extratropical cyclone late on August 1. The nontropical cyclone moved off the east, eventually crossing the International Dateline. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/06w.pdf Typhoon Dinah.] Retrieved on 2007-02-03.]

Typhoon Ed

infobox hurricane small
name=Typhoon Ed
category=cat3
type=typhoon


track=Ed 1984 track.pngformed=July 25
dissipated=August 1
highest winds=100 knots (1-min)
lowest pressure=947 mbarEd formed along the tail of a weakening cold front just south of Japan on July 23. It took a day to become detached on satellite pictures, and become a tropical disturbance. On the morning of July 25 a surface circulation had formed and the cyclone became a tropical depression. By July 26, it became a tropical storm. Initially it moved southeast during this period of strengthening as it approached Typhoon Dinah. As a shortwave trough in the Westerlies approached Ed, the cyclone turned north and moved away from Dinah. Ridging built in quickly behind the shortwave, and the cyclone turned west-northwest; a course it would maintain until landfall in mainland China. Strengthening continued, and Ed became an intense typhoon just south of Kyūshū. As it moved across the East China Sea, cooler waters and drier air led to weakening. Late on July 31, Ed made landfall 110 km north of Shang-Hai as a strong tropical storm. Turning northwest after landfall, Ed moved along the Chinese coast and gradually weakened. By late on August 1, it had dissipated as a tropical cyclone. The Korean ship Ishlin Glory sank in the Korea Strait on July 29, which led to one death and 11 others going missing. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/07w.pdf Typhoon Ed.] Retrieved on 2007-02-03.]

Tropical Storm Freda

infobox hurricane small
name=Tropical Storm Freda
category=storm
type=tropical storm


track=Freda 1984 track.pngformed=August 5
dissipated=August 8
highest winds=55 knots (1-min)
lowest pressure=982 mbarThe tail end of a trough extending southwest of Dinah west of Guam led to the development of this system. A tropical disturbance formed there on August 2 and developed a surface cyclone in the Philippine Sea later that day. A broad surface cyclone, the system tracked northwest and slowly developed. By late on August 5, it became a tropical depression. During the morning of August 6, it strengthened into a tropical storm while maintaining its broad center and a pair of circulation centers. The new northern center became dominant overnight. The system jumped northwest and quickly moved through the Formosa Straits before striking mainland China very early on August 8. After two days inland, Ed finally dissipated as a tropical cyclone, but its cloud pattern remained identifiable for an additional day or two thereafter. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/08w.pdf Tropical Storm Freda.] Retrieved on 2007-02-03.]

Tropical Depression 09W

infobox hurricane small
name=Tropical Depression 09W
category=depression
type=tropical depression


track=9-W 1984 track.pngformed=August 11
dissipated=August 15
highest winds=30 knots (1-min)
lowest pressure=996 mbarA broad surface low formed in the near equatorial trough on August 7 about 1225 km south of Guam. Moving northwest, the disturbance slowly organized as it moved into the southeast portion of the monsoon trough. On August 10, the low jogged northward for a day towards a tropical upper tropospheric low (TUTT cell) northwest of Taiwan. Late on August 11, the low became a tropical depression. It then moved west-northwest along the northern side of the monsoon trough as a sheared system due to moderate southerly flow aloft until late on August 14 when the depression merged with a low pressure area over the South China Sea, which would develop into Tropical Storm Gerald. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/09w.pdf Tropical Depression 09W.] Retrieved on 2007-02-03.]

Tropical Storm Gerald

infobox hurricane small
name=Tropical Storm Gerald
category=storm
type=tropical storm


track=Gerald 1984 track.pngformed=August 16
dissipated=August 21
highest winds=55 knots (1-min)
lowest pressure=979 mbarGerald formed within the monsoon trough in the northern South China Sea, where it meandered for its existence. The initial surface low formed on August 12 near 18N 117E. Slow development continued, and when the remains of Tropical Depression 09W became absorbed by this cyclone, thunderstorm activity increased significantly. The system was a monsoon depression, with a pressure of 997 mb, with 20-30 knots winds a bit to the south of the circulation center. Its maximum sustained winds began to migrate closer to the center, and became a tropical storm on the morning of August 16. Drifting west, Gerald slowly intensified for the next couple days. As Holly developed east of Taiwan, its outflow sheared Gerald, keeping the system from becoming a typhoon. Holly's proximity led to Gerald completing a small cyclonic loop on August 17. As Holly turned northwest, Gerald drifted westward once again. By August 20, Holly's large circulation over the East China Sea lured Gerald northeast. Shearing again increased, weakening Gerald. The cyclone made landfall about 95 km east-northeast of Hong Kong as a tropical depression. Once inland, it turned to the north and weakened rapidly. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/10w.pdf Tropical Storm Gerald.] Retrieved on 2007-02-03.]

Typhoon Holly

infobox hurricane small
name=Typhoon Holly
category=cat1
type=typhoon


track=Holly 1984 track.pngformed=August 16
dissipated=August 22
highest winds=75 knots (1-min)
lowest pressure=963 mbarThis system formed in the eastern end of the monsoon trough that spawned Gerald. A very large cyclone, it did not close off a wind circulation until it achieved tropical storm strength on the morning of August 16. Like Freda and TD 09W, it had a broad center with light winds for much of its life cycle. Kadena Air Force Base, on Okinawa, measured 16.76 inches/425 mm of rainfall from this cyclone, and two periods of winds exceeding 50 knots on August 18, and then again late August 19 and early August 20. The cyclone moved westward under the base of the subtropical ridge and reached typhoon strength on the morning of August 18. The system turned northwest and then north around the ridge's periphery at a relatively slow rate of speed. As the system turned northeast and accelerated out of the East China Sea into the Korea Strait, it led to considerable damage in the Korean peninsula and across Kyūshū. One perished, eleven were injured, and 9 went missing. Miyazake, on Kyūshū, measured 15 inches/381 mm of rainfall during a 24 hour period during Holly's passage. This rainfall led to flooding and landslides. Interaction with nearby landmasses began to weaken Holly, and interaction with a mid-level trough led to its extratropical transition. Holly became an extratropical cyclone as it approached Hokkaidō early on August 23. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/11w.pdf Typhoon Holly.] Retrieved on 2007-02-03.]

Tropical Depression 12W

infobox hurricane small
name=Tropical Depression 12W
category=depression
type=tropical depression


track=12-W 1984 track.pngformed=August 24
dissipated=August 25
highest winds=20 knots (1-min)
lowest pressure=995 mbarConvection formed in the eastern end of the monsoon trough just north of Guam on August 20, leading to the formation of a weak low pressure area by late morning August 21. The system slowly consolidated as it moved northwest, and was separating from the monsoon trough on August 23. Although convection increased in organization, the surface wind field did not respond. Nevertheless, it was deemed a tropical depression on the morning of August 24. By the next morning, the surface circulation became exposed as upper level conditions worsened due to strong southerlies aloft. The cyclone was no longer deemed tropical at that time. The surface cyclone moved northwest, crossing the Ryūkyū Islands before it merged with a frontal zone in the northern East China Sea late on August 26. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/12w.pdf Tropical Depression 12W.] Retrieved on 2007-02-03.]

Typhoon Ike (Nitang)

infobox hurricane small
name=Typhoon Ike/Nitang
category=cat4
type=typhoon


track=Ike 1984 track.pngformed=August 27
dissipated=September 6
highest winds=125 knots (1-min)
lowest pressure=947 mbar

Typhoon Ike caused extreme wind and flooding damage when it crossed the Philippines, resulting in 1492 fatalities, [Philippine Atmospheric Geophysical and Astronomical Services Administration. [http://www.pagasa.dost.gov.ph/cab/dtc_08.htm Most Destructive Tropical Cyclones for the Month of August (1948-2000).] Retrieved on 2007-02-04.] one of the Philippines' worst natural disaster in modern times. In addition, 200,000 to 480,000 were left homeless, and extensive crop damage was experienced in southern China. The name Ike was retired after this season. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/13w.pdf Typhoon Ike.] Retrieved on 2007-02-03.]

Tropical Storm June

infobox hurricane small
name=Tropical Storm June
category=storm
type=tropical storm


track=June 1984 track.pngformed=August 28
dissipated=August 30
highest winds=60 knots (1-min)
lowest pressure=983 mbarA surface low formed within the monsoon trough on August 25. The low drifted westward as convection tried to consolidate around the center. Strong upper level wind shear inhibited development for the next couple of days. It took until late on August 28 for a single circulation center to consolidate, and when it did, gale force winds around the center forced an upgrade from a monsoon depression to a tropical storm about 200 km east of Luzon. Moving westward, it struck Luzon early on August 29. By late morning, the system turned west-northwest over the mountainous island, emerging into the South China Sea. A weakness in the subtropical ridge to its north led to a turn to the northwest, and the system made landfall 240 km east of Hong Kong. When Tropical Storm June hit southeast China on August 30, 67 people were reported dead due to extensive flooding from June's broad circulation. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/14w.pdf Tropical Storm June.] Retrieved on 2007-01-13.]

Typhoon Kelly

infobox hurricane small
name=Typhoon Kelly
category=cat1
type=typhoon


track=Kelly 1984 track.pngformed=September 13
dissipated=September 18
highest winds=75 knots (1-min)
lowest pressure=965 mbarDeveloping at the southern end of a shear line, a low level circulation formed on September 13 with increasing convective organization to the south of a cold core cyclone. Completing a cyclonic loop, cool air slowly became entrained in its circulation as it continued to slowly develop. Approaching the cold low, Kelly slowed down its northward motion and reached its maximum intensity. Soon afterwards, it rapidly accelerated northeast. Losing its tropical character late on September 17, it became an extratropical cyclone on the morning of September 18. This cyclone continued moving northeast for another few days, past the International Dateline and into the Gulf of Alaska. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/15w.pdf Typhoon Kelly.] Retrieved on 2007-02-03.]

Tropical Storm Lynn

infobox hurricane small
name=Tropical Storm Lynn
category=storm
type=tropical storm


track=Lynn 1984 track.pngformed=September 24
dissipated=September 27
highest winds=40 knots (1-min)
lowest pressure=996 mbarFirst noted as an area of poorly organized thunderstorms near Guam on September 19, the disturbance moved westward across the northern Philippine Sea. As an upper tropospheric cyclone weakened east of Luzon on September 22, upper level conditions improved, but no reflection at the surface was yet witnessed. The thunderstorms entered the South China Sea on September 23 while a lee side surface low formed along the monsoon trough west of Luzon due to the strong easterly low-level flow. The disturbance rapidly consolidated, and it became a tropical depression early on September 24. Slowly intensifying as it moved west-northwest, Lynn became a tropical storm on September 25. At this point, the storm track became west-southwesterly and upper level winds began to shear thunderstorms north of the center. Weakening ensued, and Lynn struggled to maintain tropical storm intensity as it made landfall about 95 km southeast od Da Nang, Vietnam. The depression then turned northwest and dissipated near the Vietnam/Laos border early on September 28. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/16w.pdf Tropical Storm Lynn.] Retrieved on 2007-02-03.]

Tropical Storm Maury

infobox hurricane small
name=Tropical Storm Maury
category=storm
type=tropical storm


track=Maury 1984 track.pngformed=September 28
dissipated=October 1
highest winds=60 knots (1-min)
lowest pressure=992 mbarThe system formed near the intersection of the northeast end of the monsoon trough with a frontal boundary near Marcus Island just as Nina was developing 1300 km to its west on September 27. By early on September 28, it had become a tropical depression with tropical storm strength reached by noon as Maury moved north around Nina. Instead of recurving quickly around the subtropical ridge to its east and southeast, Maury slowed as it entered Nina's larger circulation. Nina absorbed Maury's circulation on October 1 as it overtook the storm from the southwest. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/17w.pdf Tropical Storm Maury.] Retrieved on 2007-02-03.]

Tropical Storm Nina

infobox hurricane small
name=Tropical Storm Nina
category=storm
type=tropical storm


track=Nina 1984 track.pngformed=September 28
dissipated=October 1
highest winds=55 knots (1-min)
lowest pressure=990 mbarLike Maury, Nina formed near the intersection of a frontal zone and the monsoon trough. On September 27, a circulation formed about 925 km north-northwest of Guam. An upper level high north of Guam allowed for further development. Moving north, the system detached from the monsoon trough, and it became a tropical depression on September 28. Southerly shear across the system led to an initially subtropical appearance, as thunderstorms moved away from the center which removed the radius of maximum winds farther from the center. This also prevented significant development. On September 29, the main belt of the Westerlies captured the cyclone, displacing thunderstorms even farther east of the center. With the low level circulation exposed, Nina weakened into a tropical depression. By late on September 30, the low level circulation moved back under the convection, which resulted in reintensification back to a tropical storm at the same time Maury was absorbed into its circulation. By late morning October 1, Nina reached its maximum intensity, but extratropical transition was already underway. Central convection decreased, and Nina became an extratropical cyclone by October 2. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/18w.pdf Tropical Storm Nina.] Retrieved on 2007-02-04.]

Typhoon Ogden

infobox hurricane small
name=Typhoon Ogden
category=cat1
type=typhoon


track=Ogden 1984 track.pngformed=October 7
dissipated=October 10
highest winds=70 knots (1-min)
lowest pressure=982 mbarA weak surface low formed west of Truk on October 3, which contained little thunderstorm activity. Moving northwest, it joined the eastern section of the monsoon trough. Following the flow around the east side of the trough towards the north, poorly organized convection became associated with the persistent low. Once it neared the northeast fringe of the trough, convective organization improved. Although still a very broad system, it became a tropical depression on the morning of October 7. Moving around the southwest part of a retreating subtropical ridge, Ogden sharply recurved. By early October 8, it strengthened into a tropical storm and passed just east of Marcus Island. The cyclone attained typhoon intensity partially due to translational motion as it began to undergo extratropical transition on October 9. Southwest shear began to significantly impact the system thereafter, which weakened the system into a tropical storm on October 10. By noon, the system had fully evolved into an extratropical cyclone. The nontropical storm continued northeast towards the International Dateline. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/19w.pdf Typhoon Ogden.] Retrieved on 2007-02-04.]

Typhoon Phyllis

infobox hurricane small
name=Typhoon Phyllis
category=cat1
type=typhoon


track=Phyllis 1984 track.pngformed=October 11
dissipated=October 14
highest winds=80 knots (1-min)
lowest pressure=974 mbarPhyllis formed within a surface trough left behind by Ogden. By late on October 7, a surface low fad formed east of Guam. The system drifted northeast. A compact system, the system became a tropical depression late on October 10 and a tropical storm on the morning of October 11. Northward acceleration had begun, and Phyllis became a typhoon the morning of October 12. A cut off low south of Honshū helped lead to strong southerly flow over Phyllis, which weakened the storm. The shear vector changed from southerly to easterly as the main belt of the Westerlies impacted the cyclone, which caused faster weakening. By the morning of October 14, Phyllis became a wave along the cold front approaching the system from the west. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/20w.pdf Typhoon Phyllis.] Retrieved on 2007-02-04.]

Tropical Storm Roy

infobox hurricane small
name=Tropical Storm Roy
category=storm
type=tropical storm


track=Roy 1984 track.pngformed=October 11
dissipated=October 13
highest winds=35 knots (1-min)
lowest pressure=996 mbarDeveloping southwest of Guam as Phyllis was forming to its northeast, a weak circulation developed on October 9. Upper level wind shear from Ogden slowed development into October 10. Thereafter, convection became better organized with the system and it became a tropical depression by October 11. A compact system, it became a tropical storm later that morning. Strong upper level easterlies halted development due to vertical wind shear. The low-level monsoon flow became diverted from Roy to Phyllis, which removed a potential source of low-level vorticity. Roy was an exposed circulation center on October 12 with decreasing convection when its lowest central pressure was reached. By the morning of October 13, it lost its defined circulation center and had dissipated as a tropical cyclone. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/21w.pdf Tropical Storm Roy.] Retrieved on 2007-02-04.]

Tropical Storm Susan

infobox hurricane small
name=Tropical Storm Susan
category=storm
type=tropical storm


track=Susan 1984 track.pngformed=October 11
dissipated=October 12
highest winds=40 knots (1-min)
lowest pressure=992 mbarOn October 10, a circulation had formed in the central South China Sea. Slow to consolidate, the low accelerated west along the axis of the monsoon trough as it became a tropical depression late on October 11. Developing as it veered west-northwest, Susan became a minimal tropical storm as it made landfall just north of Nha Trang, Vietnam. The system turned northwest up the Mekong river valley, maintaining its identity as a convective area for the next three days. Extreme flooding struck eastern and central Vietnam on October 12 caused 33 casualties and moderate crop damage. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/22w.pdf Tropical Storm Susan.] Retrieved on 2007-01-13.]

Tropical Depression 23W

infobox hurricane small
name=Tropical Depression 23W
category=depression
type=tropical depression


track=23-W 1984 track.pngformed=October 17
dissipated=October 18
highest winds=25 knots (1-min)
lowest pressure=998 mbarDeveloping within the monsoon trough, convection increased near Truk on October 16. A central convective feature formed, and the system became a tropical depression that afternoon. Moving northwest, the depression weakened as it became sheared from the north and a larger circulation formed to its southeast, which evolved into Thad. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/23w.pdf Tropical Depression 23W.] Retrieved on 2007-02-04.]

Typhoon Thad

infobox hurricane small
name=Typhoon Thad
category=cat4
type=typhoon


track=Thad 1984 track.pngformed=October 19
dissipated=October 24
highest winds=120 knots (1-min)
lowest pressure=925 mbarDeveloping southeast of Guam as Tropical Depression 23W was dissipating, this convective cluster moved north-northwest. Forming a circulation center near Truk, Thad became a tropical storm as it approached Guam on October 19. Moving east of the island, Thad became an intense typhoon very early on October 22. Recurving into the Westerlies thereafter, the cyclone slowly weakened as it accelerated northeast and became an extratropical cyclone by October 24. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/24w.pdf Typhoon Thad.] Retrieved on 2007-02-04.]

uper Typhoon Vanessa

infobox hurricane small
name=Super Typhoon Vanessa
category=cat5
type=super typhoon


track=Vanessa 1984 track.pngformed=October 22
dissipated=October 31
highest winds=155 knots (1-min)
lowest pressure=879 mbarThis system formed in the near equatorial trough southeast of Ponape a few days after Thad on October 20. The system moved northwest to just north of Ponape as it slowly developed. The disturbance strengthened into a tropical depression by October 22 and a tropical storm October 23 despite some northwesterly shear from Thad. As a minimal typhoon, Vanessa moved about 165 km south of Guam, where winds gusted to 59 knots on Nimitz Hill. Damage on the island totaled US$1.7 million (1984 dollars), mainly to the banana crop.

Moving west-northwest, Vanessa continued to strengthen, becoming a super typhoon. Super Typhoon Vanessa was the strongest typhoon of the season, reaching wind speeds of 185 mph over the open waters of the West Pacific. At its peak, it had a pressure of 879 mb, only 9 millibars higher than the record-setting Typhoon Tip of 1979. Its central pressure fell 100 mb in 48 hours. The intense cyclone recurved on October 27 and October 28 as a cold front approached from the northwest. Vanessa slowly merged with the frontal boundary, becoming a storm-force extratropical cyclone late on October 30. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/25w.pdf Super Typhoon Vanessa.] Retrieved on 2007-01-13.]

Typhoon Warren

infobox hurricane small
name=Typhoon Warren
category=cat1
type=super typhoon


track=Warren 1984 track.pngformed=October 23
dissipated=October 31
highest winds=65 knots (1-min)
lowest pressure=976 mbarThe initial disturbance formed at the end of a shear line about 555 km northeast of Mindinao. Embedded within the monsoon trough, it was a broad depression. It slowly weakened as it moved west-southwest through the Philippines into the South China Sea on October 22. Due to strengthening northeasterly low level flow, the circulation became better defined and conditions aloft favored strengthening. The system formed into a tropical depression late on October 23 despite easterly vertical wind shear. By early on October 24, Warren became a tropical storm which then turned to the north. Between October 24 and October 26, the cyclone performed a small cyclonic loop. On October 26, Warren strengthened into a typhoon.

The steering flow weakened around Warren at that time as Vanessa was moving to its northeast. Warren became entrained into Vanessa's southwestern circulation, and turned east-northeast. As Vanessa moved away from Warren, the cyclone performed an anticyclonic loop and turned back to the west on October 28. Clark Air Force Base recorded 8.74 inches/222 mm of rainfall on October 28 and October 29 due to Warren. The heavy rains over the Philippines led to landslides which killed 42 people. The passenger ferry MV Venus capsized on October 28, which led to an additional 36 deaths. The 930-ton ship Lorenzo Container VIII sank that day, which led to eight missing crew.

Another surge in the low-level northeast flow to Warren's north led to an expansion of its wind field. This cooler and drier air was also weakening the cyclone. On October 30, the storm turned west-southwest and continued weakening. By October 31 Warren had weakened to a tropical depression and it dissipated as a tropical cyclone over water. Its remaining convection moved into central Vietnam on November 1. Its weakening center led to gales along the coast. By November 2, Warren's circulation center dissipated. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/26w.pdf Typhoon Warren.] Retrieved on 2007-02-04.]

Typhoon Agnes/Undang

infobox hurricane small
name=Typhoon Agnes/Undang
category=cat4
type=typhoon


track=Agnes 1984 track.pngformed=November 1
dissipated=November 8
highest winds=120 knots (1-min)
lowest pressure=925 mbarThis system began as an area of convection along the equator on October 28. Moving northwest, the system developed. On November 1, the system became a tropical depression and then into a tropical storm. The storm turned west-northwest due to a broad ridge to its north. Intensifying into a typhoon, Agnes became an intense typhoon as it approached the Philippines. Two months after Typhoon Ike hit the central Philippines, 140 mph Typhoon Agnes struck just south of Borongan on the 4th. It crossed the islands and briefly weakened. Strengthening began as it moved through the South China Sea. It hit Quinhon, Vietnam as a 115 mph typhoon on November 7. Agnes rapidly weakened, after causing 1167 casualties and US$30 million (1984 dollars) in damage to the Philippines. [Philippine Atmospheric Geophysical and Astronomical Services Administration. [http://www.pagasa.dost.gov.ph/cab/dtc_11.htm Most Destructive Tropical Cyclones for Month of November.] Retrieved on 2007-02-04.] [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/27w.pdf Typhoon Agnes.] Retrieved on 2007-01-13.]

uper Typhoon Bill

infobox hurricane small
name=Super Typhoon Bill
category=cat4
type=super typhoon


track=Bill 1984 track.pngformed=November 8
dissipated=November 22
highest winds=130 knots (1-min)
lowest pressure=909 mbarAn area of convection organized into a tropical depression on November 8 while east of Guam. It executed a small loop, reached tropical storm strength later on the 8th, and reached typhoon intensity on the 11th. Bill continued to strengthen as it tracked westward, reaching maximum sustained winds of 150 mph on the 14th. Strong upper level winds weakened the storm, and as a break in the subtropical ridge brought the storm northward, upper level winds from Typhoon Clara weakened Bill to a tropical storm on the 18th. It looped southeastward while just east of Luzon, and looped again to the southwest on the 20th. Bill lost his battle on the November 22, after causing minor damage on its path. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/28w.pdf Super Typhoon Bill.] Retrieved on 2007-02-04.]

Typhoon Clara

infobox hurricane small
name=Typhoon Clara
category=cat3
type=typhoon


track=Clara 1984 track.pngformed=November 14
dissipated=November 21
highest winds=110 knots (1-min)
lowest pressure=938 mbarA large, low-latitude disturbance formed in the eastern Caroline islands on November 11. By November 13, the surface low was gaining significant amounts of convection. Its circulation was aided by a tropical disturbance to its south in the Solomon islands which enhanced westerly flow between the two system, increasing the low level vorticity within the northern hemisphere system. Consolidation of the system began, and the system became a tropical depression on November 14. Further development of this system into a tropical storm and typhoon was accompanied by an expansion in the size of its circulation. As Clara recurved east of 132E, it passed within 930 km of Bill, which radically changed Bill's course and weakened both cyclones. Once Bill moved farther away, Clara reintensified into a strong typhoon by November 20. Recurvature of Clara continued, and it became an extratropical cyclone along an approaching frontal zone, and was able to be followed through November 22. Iwo-Jima reported 40 knot winds with gusts to 63 knots as Clara passed by to the north. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/29w.pdf Typhoon Clara.] Retrieved on 2007-02-04.]

Typhoon Doyle

infobox hurricane small
name=Typhoon Doyle
category=cat4
type=typhoon


track=Doyle 1984 track.pngformed=December 4
dissipated=December 11
highest winds=125 knots (1-min)
lowest pressure=935 mbarIts initial tropical disturbance was first noted near 5N 156E on December 1. The system moved west-northwest, slowly developing. A low-level circulation in the Coral Sea helped enhance westerly flow to its south, which spun up a tropical depression late on December 4 and a tropical storm early on December 5. Intensification continued, and typhoon strength was reached late on December 6. Turning more northwest, the typhoon became intense early on December 8. As it recurved northward, the cyclone weakened quickly late on December 9 and early on December 10. The cyclone became an exposed circulation, and dissipated as a tropical cyclone over water late on December 11. [Joint Typhoon Warning Center. [http://metocph.nmci.navy.mil/jtwc/atcr/1984atcr/pdf/wnp/30w.pdf Typhoon Doyle.] Retrieved on 2007-02-03.]

1984 storm names

Western North Pacific tropical cyclones were named by the Joint Typhoon Warning Center. The first storm of 1984 was named Vernon and the final one was named Doyle. The name Ike was retired after this season.

ee also

*1984 Pacific hurricane season
*1984 Atlantic hurricane season
*1984 North Indian cyclone season

References

External links

* [http://www.typhoon2000.ph Typhoon2000 Philippine typhoon website] .
* [http://www.typhoon2000.ph/plotting/PhilippineTyphoonChart.gifPhilippine Area of Responsibility] .
* [https://metocph.nmci.navy.mil/jtwc.html Joint Typhoon Warning Center] .
* [http://www.weather.gov.hk/informtc/sound/tc_pronunciatione.htm Meaning of Tokyo Typhoon Centre names] .