The 1979 Pacific typhoon season featured the largest and most intense tropical cyclone recorded globally, Typhoon Tip. The season also used both male and female names as tropical cyclone names for the first time. Additionally, the season was slightly below-average in terms of tropical cyclone activity, with only 24 storms, 12 typhoons, and 4 super typhoons developing. The season had no official bounds; it ran year-round in 1979, but most tropical cyclones tend to form in the northwestern Pacific Ocean between June and December. 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 east of the date line and north of the equator are called hurricanes; see 1979 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.
Seasonal summary
54 tropical depressions formed this year in the Western Pacific, of which 24 became tropical storms. 13 storms reached typhoon intensity, of which 4 reached super typhoon strength.
On December 31, a tropical depression developed over the low latitudes of the open West Pacific. It tracked northwestward, reaching tropical storm strength that night and typhoon strength on the 5th. Alice turned to the west, and continued to intensify with generally favorable conditions to a peak of 125mph winds on the 8th.[1] Cooler, drier air to the north caused Alice to weaken to a minimal typhoon, but as the typhoon turned to the northwest it briefly re-strengthened to a 115mph typhoon on January 11. Upper-level winds, combined with the dry air, weakened Alice for good, causing it to dissipate on the 14th after stalling for three days. Alice caused extensive damage in the Marshall Islands.
Typhoon Bess was the third typhoon since 1959 to develop in the month of March. Bess began as a weak surface circulation on March 16. The circulation intensified into a tropical depression on March 19. Bess then reached tropical storm strength on March 21. Slow intensification occurred for 18 hours,[1] before Bess reached its peak intensity of 105mph (169km/h) early on March 23.[2] Bess held on to its peak intensity for 18 hours before vertical wind shear caused Bess to rapidly dissipate on March 25.[1] Typhoon Bess remained away from land, and therefore caused no deaths or damage.
Typhoon Cecil formed on the 10th from an easterly wave in early April.[1] The storm then reached its maximum intensity as a category 1 typhoon on the 14th. Typhoon Cecil then dissipated on April 20.[3] Typhoon Cecil stuck Leyte on April 15, causing 18 deaths, damage of $10 million and leaving 8,900 homeless.[4] Cecil was also the first tropical cyclone in the Western Pacific to be given a male name.[1]
A tropical disturbance developed on May 6.[1] By May 10, the disturbance was upgraded to a tropical depression. It then was upgraded to a tropical storm on May 11. Dot then reached its peak intensity as a weak tropical storm the next day. Dot was downgraded to a tropical depression late on the 14th. The storm dissipated on May 17.[5]
Initially, TD 05 drifted southwestward east of the Paracel Islands. TD 05 was not forecast to intensify significantly, but it merged with an extratropical frontal boundary near 22.N 124.8E and produced an improved satellite signature which included a banding-type eye.[1]
A tropical disturbance was first noted on satellite and synoptic data on June 25.[1] The disturbance was upgraded to a tropical depression about 670 nautical miles east of Manila on July 1. It rapidly intensified into a tropical storm and moved west-northwest.[6] Ellis was in a favorable position at that time and steady intensification occurred over the next 2 days. Ellis intensified into a typhoon on July 2 and reached its peak intensity of 100mph on later that day. Continued intensification was anticipated at that time, but a slow weakening trend was actually observed.[1] The storm passed close to the northern tip of Luzon on July 4 and caused damage to tobacco-rich regions of the Philippines. Ellis then entered the South China Sea and weakened to a severe tropical storm while still moving west-northwest.[6] Ellis made landfall on the Chinese coast on July 6 about 164 nautical miles southwest of Hong Kong and dissipated rapidly over land thereafter.[1] Damage caused by Ellis in Hong Kong was minimal.[6]
A closed surface circulation was detected on June 28 about 920mi (1,480km) southeast of Guam.[1] The associated convective activity remained disorganized until July 1. A few hours later, the disturbance intensified into a tropical depression. On July 3, it was upgraded to a tropical storm and was named Faye.[7] Faye was forecast to reach typhoon status in the next 18 hours. However, Faye weakened.[1] Faye was then downgraded to a tropical depression on July 4. Faye then dissipated on July 7 at 17N, 129.60E.[7]
A tropical depression formed southeast of Guam on July 24.[1] It headed to the west-northwest, but upper-level shear from the TUTT caused the depression to dissipate on the 27th. It turned northward then westward, where it regenerated on the 28th. Intensification became more steady, with the depression reaching storm strength on the 28th and typhoon strength on the 29th. On the 31st, Hope reached a peak of 150mph, but land interaction with Taiwan to the north weakened the storm. On August 2, Typhoon Hope struck southern China, about 10miles east of Hong Kong. It weakened over the country while moving westward, but retained its satellite signature. Upon reaching the Bay of Bengal on the 7th, Hope restrengthened to a tropical storm, but moved over India and dissipated on the 8th. In Guangdong Province in China, the typhoon was responsible for around 100 deaths or missing people. Twelve people died along with 260 injured in Hong Kong. Hope was the strongest tropical cyclone to hit Hong Kong since Typhoon Rose in 1971.
The monsoon trough spawned a tropical depression on August 7 to the east of the Philippines. It tracked to the north then to the west. Steering currents weakened, causing the depression to loop to the north. It was able to strengthen there, reaching tropical storm status on the 11th and typhoon status on the 13th. Irving continued to the north, attaining a peak of 100mph winds on the 15th.[1] Its broad, loose wind field prevented it from strengthening further, and Irving weakened as it continued northward. On the 17th, Irving hit southwest South Korea as a minimal typhoon, and merged with a frontal boundary over extreme eastern Russia on the 18th. Torrential rains led to 150 fatalities, with damage at $10–$20million (1979USD).[citation needed]
A tropical disturbance organized into a tropical storm on August 15. It tracked to the northwest, becoming a tropical storm on the 17th. Judy rapidly intensified, reaching typhoon status on the 18th and a peak of 155mph winds on the 20th. It also had an eye temperature of 34.0°C (93.2°F) at 700 hPa height, making it the warmest eye of a tropical cyclone on record.[1] The super typhoon began to weaken as it passed south of Okinawa, and neared the Chinese coast on the 23rd and 24th. Judy turned to the northeast, and brushed past South Korea as a tropical depression on the 26th, shortly before dissipating. Judy passed through Guam and other Pacific islands, but damage was reported light there. However, the storm brought heavy rain to Korea as a tropical depression, killing 111 and causing more damage to an area hit by Irving just weeks before.
A tropical disturbance developed on August 30 and became a tropical depression later that day.[1] The depression was upgraded to a tropical storm and was named Ken. Ken reached peak winds of 70mph (110km/h) on September 3. The storm moved north and turned north-northeast, striking Shikoku late on the 3rd. Ken weakened over Japan and dissipated on September 4.[8]
Around the same time the precursor to Tropical Storm Ken developed, a tropical disturbance developed south of Marcus Island.[1] The disturbance became a tropical depression on the 2nd and a tropical storm on the 4th. Lola was upgraded to a typhoon early on September 5. The storm continued to intensify and reached peak intensity on September 6 with winds of 105mph (169km/h). Lola weakened to a tropical storm on the 7th. The next day, Lola weakened to a tropical depression at 35.90N, 151.80E.[9] Lola then transitioned into an extratropical cyclone on September 9 to the east of Japan.[1]
A weak surface circulation formed northeast of Yap on September 12, tracking westward. On September 16, the circulation gained tropical storm intensity and was named Mac. Mac attained peak intensity before making landfall in the Philippines, causing the storm to weaken. Frictional effects caused the storm to weaken over southern Luzon. Due to Tropical Storm Nancy's development, Mac's track was influenced into the South China Sea. Mac made landfall near Hong Kong and dissipated on September 24.[10]
On September 17, a tropical disturbance rapidly developed into a tropical storm and was given the name Nancy. Weak steering currents allowed Nancy to track across the southern portion of Hainan and do a cyclonic loop. The weak currents allowed Nancy to make landfall in Vietnam before dissipating on September 22.[10]
A tropical disturbance developed south of Guam during September 19.[1] The disturbance was upgraded to a tropical depression on September 22. It then was upgraded to a tropical storm the next day. Owen was upgraded to a typhoon on the 25th. Owen then reached its peak intensity on September 26 with winds of 125mph (201km/h).[11] Owen then started to weaken as the storm moved northward. By the 30th, Owen made landfall near Osaka, Japan and weakened to a tropical storm. Owen then transitioned into an extratropical cyclone on October 1.[1] In Japan, Owen killed 12 people and injured another 83.[12]
Developing at the apex of a wave in the easterly flow in late September 1979, Tropical Storm Pamela formed on September 23 and dissipated on September 26, due to strong shear caused by the nearby Typhoon Owen.[1]
The monsoon trough spawned a disturbance in the eastern Vietnamese Sea on September30, which developed into Tropical Depression Sisang on October 1. It drifted eastward into Luzon, and looped to the southwest, where it strengthened into a tropical storm, with the JTWC naming the storm Sarah on October4.[1] Around this time, the PAGASA renamed the system as Uring. Sarah, with weak steering currents, drifted to the south, becoming a typhoon on October 7, before making landfall on Palawan Island. The storm turned to the west, peaking with 130mph winds on October 10, before the mid-level circulation became decoupled from the low-level circulation. Sarah weakened, and hit eastern Vietnam on October 14 as a 60mph tropical storm. The storm brought heavy flooding and wind, causing massive crop damage and loss of life. Sarah then weakened to a low-pressure area on October15, but its remnants turned eastward towards Manila, Philippines, before curving westward towards Vietnam again. The storm's remnants fully dissipated on October23.
Convective activity increased in the monsoon trough that extended over the Caroline Islands on September 28. Post-analysis indicated the existence of a weak circulation southwest of Guam around that time, which was to become Tropical Storm Roger. On October 3, the system organized into Tropical Depression 21W, which was subsequently upgraded to a tropical storm and named Roger on October 4.[1] Strong flow from the equator was drawn into Roger's circulation, preventing development to a disturbance to the east which would become Typhoon Tip.[13] A strong mid-level southeasterly steering current caused Roger to move northwest. Roger then executed a cyclonic loop on October 5. The storm continued to move northwest until north of the ridge axis, after which it turned in a north-northeastward direction. Roger then became an extratropical cyclone on October 7, as it merged with a cold front south of Japan.[1]
Typhoon Tip is considered to be both the most intense tropical cyclone ever recorded in the world, with a minimum pressure of 870 mbar, as well as the largest ever recorded, with a diameter of more than 2,000km (1,200mi).[1] The cyclone formed on October 5, and after moving into a very favorable environment for development, quickly strengthened into Super Typhoon Tip on the 11th. On the 12th, Super Typhoon Tip continued to intensify, with winds at 190miles per hour and central pressure at 870millibars, the lowest barometric pressure ever recorded from a tropical cyclone. Tip ultimately hit Japan, causing 68 deaths and moderate damage. The storm became extratropical on October 19, and was last tracked to a point near the Alaskan Aleutian Islands. Tip may have made landfall as an extratropical cyclone near Cold Bay, in Alaska.
Vera began as a tropical disturbance in the near equatorial trough on October 27. The disturbance rapidly intensified into a tropical storm and was named Vera on November 2. Vera continued to intensify and reached typhoon strength on November 3.[1] The storm rapidly intensified, reaching its peak intensity as a super typhoon with 160mph (260km/h) winds on November 4.[14] Reconnaissance aircraft indicated that Vera maintained its peak strength for 24 hours before weakening as it approached Catanduanes Island.[1] The next day, Vera weakened to a category 4 storm with 130mph (210km/h) winds.[14] The Philippines began restricting low-level inflow as Vera continued northwestward toward northern Luzon. Vera made landfall north of Tarigtig Point with winds of 105mph (169km/h) on the 6th. Shortly after making landfall, an enhanced low-level northeasterly flow over the Taiwan Strait coupled with strong upper-level southwesterlies over the Philippines resulted in the storm's weakening. After moving into the South China Sea, the strong northeast monsoon flow accelerated Vera southwestward and Vera dissipated at 12:00 UTC November 7.[1]
A mid-level circulation was detected on satellite imagery in early November. Wayne moved to the north initially and began to develop more definitive surface circulation on November 7. Wayne turned to the west, tracking toward the central Philippines on November 11. Wayne dissipated as it made landfall in Luzon on November 13.[1]
A tropical disturbance developed over the Marshall Islands on November 29.[1] The disturbance then intensified into Tropical Depression 27W on December 1. 27W then intensified into a tropical storm and was named Abby.[15] The storm moved west and turned to the northwest, while reducing its forward movement on December 3. The JTWC predicted intensification as the storm moved towards Guam. However, Abby weakened to a tropical depression on the 6th as it moved west of Truk. On December 7, Abby reintensified into a weak tropical storm. On the 8th, Abby weakened once again to a tropical depression and accelerated forward. By December 9, aircraft reconnaissance indicated that Abby had two centers of circulation. On the 10th, Abby attained typhoon strength which made it the last typhoon of 1979. On the next day, Abby recurved in response to a mid-tropospheric short-wave trough. Typhoon Abby reached maximum intensity of 125mph (201km/h) with a minimum pressure of 951 mb on December 13. As Abby continued to move east-northeast, it rapidly weakened due to strong westerlies. Typhoon Abby then dissipated on December 14 due to strong shear.[1]
A tropical depression developed on December 20.[1] Later that day, the depression was upgraded to a tropical storm. Ben then reached its peak intensity on December 22 with winds of 70mph (110km/h).) The storm was downgraded to a tropical depression on the 23rd and dissipated later that day.[16] Ben was the last tropical cyclone of the 1979 Pacific typhoon season.
During the season 23 named tropical cyclones developed in the Western Pacific and were named by the Joint Typhoon Warning Center, when it was determined that they had become tropical storms. These names were contributed to a revised list starting this year, which now includes both female and male names.
Alice
Bess
Cecil
Dot
Ellis
Faye
Gordon
Hope
Irving
Judy
Ken
Lola
Mac
Nancy
Owen
Pamela
Roger
Sarah
Tip
Vera
Wayne
Abby
Ben
Philippines
Auring
Bebeng
Karing
Diding
Etang
Gening
Herming
Ising
Luding
Mameng
Neneng
Oniang
Pepang
Rosing
Sisang
Trining
Uring
Warling
Yayang
Auxiliary list
Ading
Barang
Krising
Dadang(unused)
Erling(unused)
Goying(unused)
The Philippine Atmospheric, Geophysical and Astronomical Services Administration uses its own naming scheme for tropical cyclones in their area of responsibility. PAGASA assigns names to tropical depressions that form within their area of responsibility and any tropical cyclone that might move into their area of responsibility. Should the list of names for a given year prove to be insufficient, names are taken from an auxiliary list, the first 6 of which are published each year before the season starts. Names not retired from this list will be used again in the 1983 season. This is the same list used for the 1975 season. PAGASA uses its own naming scheme that starts in the Filipino alphabet, with names of Filipino female names ending with "ng" (A, B, K, D, etc.). Names that were not assigned/going to use are marked in gray.
Retirement
Naming storms using both female and male names are supposed to be used alternatively. Because Alice is a female name followed by Bess with the same gender, the JTWC retired the name Alice and replaced it with Andy, a male name, which was first used in the 1982 season.
Season effects
This is a table of all of the storms that have formed in the 1979 Pacific typhoon season. It includes their duration, names, affected areas, damages, and death totals. Deaths in parentheses are additional and indirect (an example of an indirect death would be a traffic accident), but were still related to that storm. Damage and deaths include totals while the storm was extratropical, a wave, or a low, and all of the damage figures are in 1979 USD. Names listed in parentheses were assigned by PAGASA.
The 1997 Pacific hurricane season was a very active hurricane season. With hundreds of deaths and hundreds of millions of dollars in damage, this was one of the deadliest and costliest Pacific hurricane seasons on record. This was due to the exceptionally strong 1997–98 El Niño event. The season officially started on May 15, in the eastern Pacific, and on June 1, in the central Pacific, and lasted until November 30. These dates conventionally delimit the period of each year when almost all tropical cyclones form in the northeastern Pacific Ocean.
The 2005 Pacific typhoon season was the least active typhoon season since 2000, producing 23 named storms, of which 13 became typhoons. It was an event in the annual cycle of tropical cyclone formation, in which tropical cyclones form in the western Pacific Ocean. The season ran throughout 2005, though most tropical cyclones typically develop between May and October. The season's first named storm, Kulap, developed on January 13, while the season's last named storm, Bolaven, dissipated on November 20. The season's first typhoon, Haitang, reached typhoon status on July 13, and became the first super typhoon of the year three days later.
The 2000 Pacific typhoon season marked the first year using names contributed by the World Meteorological Organization. It was a rather below-average season, producing a total of 23 tropical storms, 13 typhoons and 4 intense typhoons. The season ran throughout 2000, though typically most tropical cyclones develop between May and October. The season's first named storm, Damrey, developed on May 7, while the season's last named storm, Soulik, dissipated on January 4 of the next year.
The 1999 Pacific typhoon season was the last Pacific typhoon season to use English names as storm names. It also featured the lowest number of typhoons on record, with only five reaching this intensity. This was mainly due to a strong La Niña which persisted from last year. The season was also below-average in named storms, with only 20 of such spawning. It had no official bounds; it ran year-round in 1999, 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. The first named storm, Hilda, developed on January 6, while the last named storm, Gloria, dissipated on November 16.
The 1998 Pacific typhoon season was the least active Pacific typhoon season on record, until it was surpassed 12 years later. It would produce 16 tropical storms, 8 strengthening into typhoons. 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 east of the date line and north of the equator are called hurricanes; see 1998 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.
The 1992 Pacific typhoon season is the fourth consecutive above-average season, producing 31 tropical storms, 16 typhoons and five super typhoons. It had no official bounds; it ran year-round in 1992. Despite this, 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.
The 1991 Pacific typhoon season was a slightly above-average season with 29 tropical storms, 17 typhoons and five super typhoons forming. It was quite a catastrophic season – Typhoon Yunya impacted the Philippines in mid June while in the same time experiencing a volcanic eruption, Typhoon Mireille severely impacting Japan, which became known for being the costliest typhoon on record with US$10 billion worths of damages, and Tropical Storm Thelma on November which became one of the deadliest storms to strike the Philippines, killing at least over 5,000 people.
The 1990 Pacific typhoon season was another active season. It has no official bounds; it ran year-round in 1990, 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.
The 1988 Pacific typhoon season was a very active season in terms of named storms, though it only featured 11 typhoons and 1 super typhoon. It had no official bounds; it ran year-round in 1988, but most tropical cyclones formed between May and November. Tropical storms that formed in the entire west Pacific basin were assigned a name by the Joint Typhoon Warning Center. 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.
The 1987 Pacific typhoon season was a below average season, though it featured a relatively high amount of typhoons. It had no official bounds; it ran year-round in 1987, but most tropical cyclones formed between May and November. Tropical storms that formed in the entire basin were assigned a name by the Joint Typhoon Warning Center. 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.
The 1986 Pacific typhoon season was an above average season, featuring 29 named storms, 19 typhoons, and 3 super typhoons. It has no official bounds; it ran year-round in 1986, but most tropical cyclones tend to form in the northwestern Pacific Ocean between May and December. These dates conventionally delimit the period of each year when most tropical cyclones form in the northwestern Pacific Ocean. Tropical Storms formed in the entire west pacific basin were assigned a name by the Joint Typhoon Warning Center. 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.
The 1985 Pacific typhoon season was a slightly above average season in terms of named storms, though most storms were weak and short-lived. The season had 28 named storms, 15 typhoons and 1 super typhoon. It ran year-round, thus ending the two-season run which began in 1983 that only had tropical cyclones forming between June and December. These dates conventionally delimit the period of each year when most tropical cyclones form in the northwestern Pacific Ocean. A total of 57 tropical depressions formed this year, of which only 28 became tropical storms and were assigned a name by the Joint Typhoon Warning Center. This made the season well above average. Additionally, tropical depressions that enter or form in the Philippine area of responsibility were 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. This year, a total of 17 storms were named this way.
The 1983 Pacific typhoon season was the latest start for a Pacific typhoon season on record, and also slightly below-average in terms of named storms. It ran year-round in 1983, but all tropical cyclones formed between June and December. These dates conventionally delimit the period of each year when most tropical cyclones form in the northwestern Pacific Ocean. A total of 32 tropical depressions formed this year, of which only 23 became tropical storms and were assigned a name by the Joint Typhoon Warning Center. Additionally, 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. This year, a total of 23 storms were named this way.
The 1980 Pacific typhoon season was a slightly-below average season when compared to the long-term average, though it featured several intense storms. It ran year-round in 1980, but most tropical cyclones formed between June and December. These dates conventionally delimit the period of each year when most tropical cyclones form in the northwestern Pacific Ocean. A total of 28 tropical depressions formed this year in the Western Pacific, of which 24 became tropical storms and were assigned a name by the Joint Typhoon Warning Center. Beginning in March, tropical cyclones formed in each subsequent month through December. Of the 24 named storms, 15 storms reached typhoon intensity, of which 2 reached super typhoon strength.
The 1959 Pacific typhoon season was regarded as one of the most devastating years for Pacific typhoons on record, with China, Japan and South Korea sustaining catastrophic losses. It was an event in the annual cycle of tropical cyclone formation. The season had no official bounds, but tropical cyclones in the Western Pacific Ocean normally develop between May and October.
The 1970 Pacific typhoon season has no official bounds; it ran year-round in 1970, but most tropical cyclones tend to form in the northwestern Pacific Ocean between June and December. These dates conventionally delimit the period of each year when most tropical cyclones form in the northwestern Pacific Ocean.
The 1975 Pacific typhoon season was one of the deadliest tropical cyclone seasons on record, with nearly 229,000 fatalities occurring during the season. It had no official bounds; it ran year-round in 1975, but most tropical cyclones tend to form in the northwestern Pacific Ocean between June and December. These dates conventionally delimit the period of each year when most tropical cyclones form in the northwestern Pacific Ocean.
The 1974 Pacific typhoon season was the first season on record to not feature a Category 5 equivalent super typhoon; a feat later repeated by the 1977 and 2017 seasons. Even so, the season was overly active, with 32 tropical storms and 16 typhoons being developed this year. It has no official bounds; it ran year-round in 1974, but most tropical cyclones tend to form in the northwestern Pacific Ocean between June and December. These dates conventionally delimit the period of each year when most tropical cyclones form in the northwestern Pacific Ocean.
The 1972 Pacific typhoon season was an above average season, producing 31 tropical storms, 24 typhoons and 2 intense typhoons. It has no official bounds; it ran year-round in 1972, but most tropical cyclones tend to form in the northwestern Pacific Ocean between June and December. These dates conventionally delimit the period of each year when most tropical cyclones form in the northwestern Pacific Ocean.
The 1957 Pacific typhoon season has no official bounds; it ran year-round in 1957, but most tropical cyclones tend to form in the northwestern Pacific Ocean between June and December. These dates conventionally delimit the period of each year when most tropical cyclones form in the northwestern Pacific Ocean.
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